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All questions of Sexual Reproduction in Flowering Plants for NEET Exam
An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is :[2012]
- a)Cuticle
- b)Sporopollenin
- c)Lignin
- d)Cellulose
Correct answer is option 'B'. Can you explain this answer?
An organic substance that can withstand environmental extremes and cannot be degraded by any enzyme is :[2012]
a)
Cuticle
b)
Sporopollenin
c)
Lignin
d)
Cellulose
|
Pooja Mehta answered |
Sporopollenin is a fatty substance present in the exine of pollen grains. It is resistant to microbial and chemical decomposition and can withstand the extreme environmental conditions. Due to presence of sporopollenin, pollen grains are well preserved during fossilization.
The plant parts which consists of two generation one within the other: (2020)
(a) Pollen grains inside the anther
(b) Germinated pollen grain with two male gametes
(c) Seed inside the fruit
(d) Embryo sac inside the ovule
- a)(a), (b) and (c)
- b)(c) and (d)
- c)(a) and (d)
- d)(a) only
Correct answer is option 'C'. Can you explain this answer?
The plant parts which consists of two generation one within the other: (2020)
(a) Pollen grains inside the anther
(b) Germinated pollen grain with two male gametes
(c) Seed inside the fruit
(d) Embryo sac inside the ovule
(a) Pollen grains inside the anther
(b) Germinated pollen grain with two male gametes
(c) Seed inside the fruit
(d) Embryo sac inside the ovule
a)
(a), (b) and (c)
b)
(c) and (d)
c)
(a) and (d)
d)
(a) only
|
Sanjana Reddy answered |
The plant parts which consist of two generations, one within the other are:
(d) Embryo sac inside the ovule - The ovule is the female reproductive part of the flower which contains the embryo sac. The embryo sac is the female gametophyte that contains the egg cell and other cells required for fertilization. The ovule develops into a seed after fertilization.
(a) Pollen grains inside the anther - The anther is the male reproductive part of the flower which produces pollen grains. The pollen grains contain the male gametes that are required for fertilization.
Therefore, option (c) (a) and (d) is the correct answer as both the embryo sac and the pollen grains are gametophytes, which are the first generation of plants, whereas the ovule and anther are sporophytes, which are the second generation of plants.
(d) Embryo sac inside the ovule - The ovule is the female reproductive part of the flower which contains the embryo sac. The embryo sac is the female gametophyte that contains the egg cell and other cells required for fertilization. The ovule develops into a seed after fertilization.
(a) Pollen grains inside the anther - The anther is the male reproductive part of the flower which produces pollen grains. The pollen grains contain the male gametes that are required for fertilization.
Therefore, option (c) (a) and (d) is the correct answer as both the embryo sac and the pollen grains are gametophytes, which are the first generation of plants, whereas the ovule and anther are sporophytes, which are the second generation of plants.
Which of the following statements is not correct? [2016]- a)Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same species grows into the style.
- b)Insects that consume pollen or nectar without bringing about pollination are called pollen/nectar robbers.
- c)Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil.
- d)Some reptiles have also been reported as pollinators in some plant species.
Correct answer is option 'A'. Can you explain this answer?
Which of the following statements is not correct? [2016]
a)
Pollen grains of many species can germinate on the stigma of a flower, but only one pollen tube of the same species grows into the style.
b)
Insects that consume pollen or nectar without bringing about pollination are called pollen/nectar robbers.
c)
Pollen germination and pollen tube growth are regulated by chemical components of pollen interacting with those of the pistil.
d)
Some reptiles have also been reported as pollinators in some plant species.
|
Rajesh Datta answered |
(a) Pollen grains of different species are incompatible, so they fail to germinate. If the pollen-stigma interaction is compatible, the pollen grain hydrates and germinates shortly following landing on the stigma.
Megaspores are produced from the megaspore mother cells after[NEET Kar. 2013]- a)Meiotic division
- b)Mitotic division
- c)Formation of a thick wall
- d)Differentiation
Correct answer is option 'B'. Can you explain this answer?
Megaspores are produced from the megaspore mother cells after
[NEET Kar. 2013]
a)
Meiotic division
b)
Mitotic division
c)
Formation of a thick wall
d)
Differentiation
|
|
Pooja Mehta answered |
Single Megaspore Mothe Cell (MMC) with dense cytoplasm aond a prominent nucleus gets differentiated from nucellus near the micropylar region. This Megaspore Mother Cell (MMC) undergoes meiosis to form ‘4’ haploid cells called megaspores and the process of formation of known as megasporogenesis. Hence, correct option is (B).
Animal vectors are required for pollination in[NEET Kar. 2013]- a)Maize
- b)Vallisneria
- c)Mulberry
- d)Cucumber
Correct answer is option 'A'. Can you explain this answer?
Animal vectors are required for pollination in
[NEET Kar. 2013]
a)
Maize
b)
Vallisneria
c)
Mulberry
d)
Cucumber
|
Dilip Chaurasiya answered |
In maize pollination by Air generally
Which one of the following may require pollinators, but is genetically similar to autogamy? [2015 RS]- a)Xenogamy
- b)Apogamy
- c)Cleistogamy
- d)Geitonogamy
Correct answer is option 'D'. Can you explain this answer?
Which one of the following may require pollinators, but is genetically similar to autogamy? [2015 RS]
a)
Xenogamy
b)
Apogamy
c)
Cleistogamy
d)
Geitonogamy
|
Moumita Khanna answered |
(d) Geitonogamy, genetically, shows similarity with autogamy because the pollen grains are born on the same plant.
Which of the following statements iscorrect? [NEET Kar. 2013]- a)Sporopollenin can withstand high temperatures but not strong acids
- b)Sporopollenin can be degraded by enzymes
- c)Sporopollenin is made up of inorganic materials
- d)Sporopollenin can withstand high temperatures as well as strong acids and alkalis
Correct answer is option 'D'. Can you explain this answer?
Which of the following statements iscorrect?
[NEET Kar. 2013]
a)
Sporopollenin can withstand high temperatures but not strong acids
b)
Sporopollenin can be degraded by enzymes
c)
Sporopollenin is made up of inorganic materials
d)
Sporopollenin can withstand high temperatures as well as strong acids and alkalis
|
Aditi Azade answered |
Sporopollenin is one of the most resistant organic material,it can withstand high temperature and strong acid and alkali. No enzyme that degrade sporopollenin is known.
The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which during pollination, brings genetically different types of pollen grains to stigma, is: (2021)- a)Chasmogamy
- b)Cleistogamy
- c)Xenogamy
- d)Geitonogamy
Correct answer is option 'C'. Can you explain this answer?
The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which during pollination, brings genetically different types of pollen grains to stigma, is:
(2021)
a)
Chasmogamy
b)
Cleistogamy
c)
Xenogamy
d)
Geitonogamy
|
Suresh Iyer answered |
Xenogamy – Transfer of pollen grains from anther to the stigma of a different plant. This is the only type of pollination which during pollination brings genetically different types of pollen grains to the stigma.
Filiform apparatus is characteristic feature of: [2015 RS]- a)Nucellar embryo
- b)Aleurone cell
- c)Synergids
- d)Generative cell
Correct answer is option 'C'. Can you explain this answer?
Filiform apparatus is characteristic feature of: [2015 RS]
a)
Nucellar embryo
b)
Aleurone cell
c)
Synergids
d)
Generative cell
|
|
Wahid Khan answered |
(c) Synergids have filiform apparatus. correct answer
Even in absence of pollinating agents seed setting is assured in [2012]- a)Commellina
- b)Zostera
- c)Salvia
- d)Fig
Correct answer is option 'A'. Can you explain this answer?
Even in absence of pollinating agents seed setting is assured in [2012]
a)
Commellina
b)
Zostera
c)
Salvia
d)
Fig
|
Gaurav Kumar answered |
Commelina bears aerial, chasmogamous (stigma and anthers exposed to pollinating agents), insect pollinated flowers and underground cleistogamous flowers. Cleistogamous flowers are bisexual flowers which never open. In such flowers, the anther and stigma lie very close to each other. When anther dehisce in the flower buds, pollen grains come in contact with the stigma of the same flower i.e, autogamy occurs. So, these flowers produce an assured seed set, even in the absence of pollinators.
Endosperm is consumed by developing embryo in the seed of[2008]- a)coconut
- b)castor
- c)pea
- d)maize
Correct answer is option 'C'. Can you explain this answer?
Endosperm is consumed by developing embryo in the seed of
[2008]
a)
coconut
b)
castor
c)
pea
d)
maize
|
Dipanjan Mehta answered |
In pea, endosperm is consumed by developing embryo in the seed. The endosperm is completely absorbed by the growing embryo and the food reserve gets stored in the cotyledons. Such seeds are called non endospermic or exalbuminous.
Albuminous seeds store their reserve food mainly in[NEET Kar. 2013]- a)Perisperm
- b)Endosperm
- c)Cotyledons
- d)Hypocotyl
Correct answer is option 'B'. Can you explain this answer?
Albuminous seeds store their reserve food mainly in
[NEET Kar. 2013]
a)
Perisperm
b)
Endosperm
c)
Cotyledons
d)
Hypocotyl
|
Nilotpal Gupta answered |
Endosperm is the nutritive tissue which provides nourishment to the embryo in seed plant. Albuminous seeds retain a part of endosperm as it is not completely used up during embryo development (e.g., wheat, maize, barley, castor, sunflower).
Which one of the following statements is not true? [2016]- a)Tapetum helps in the dehiscence of anther
- b)Exine of pollen grains is made up of sporopollenin
- c)Pollen grains of many species cause severe allergies
- d)Stored pollen in liquid nitrogen can be used in the crop breeding programmes
Correct answer is option 'A'. Can you explain this answer?
Which one of the following statements is not true? [2016]
a)
Tapetum helps in the dehiscence of anther
b)
Exine of pollen grains is made up of sporopollenin
c)
Pollen grains of many species cause severe allergies
d)
Stored pollen in liquid nitrogen can be used in the crop breeding programmes
|
Anu Bajaj answered |
(a) Tapetum is important for the nutrition and development of pollen grains, as well as a source of precursors for the pollen coat.
Function of filiform apparatus is to: [2014]- a)Recognize the suitable pollen at stigma
- b)Stimulate division of generative cell
- c)Produce nectar
- d)Guide the entry of pollen tube
Correct answer is option 'D'. Can you explain this answer?
Function of filiform apparatus is to: [2014]
a)
Recognize the suitable pollen at stigma
b)
Stimulate division of generative cell
c)
Produce nectar
d)
Guide the entry of pollen tube
|
Jatin Chakraborty answered |
(d) Filiform apparatus helps in the entry of pollen tube into a synergid in ovule. Filiform apparatus is in form of finger like projection comprising a core of micro fibrils enclosed in a sheath. It resembles transfer cells meant for short distance movement of metabolites. It is responsible for the absorption of food from the nucleus.
Male gametes in angiosperms are formed by the division of[2007]- a)generative cell
- b)vegetative cell
- c)microspore mother cell
- d)microspore.
Correct answer is option 'A'. Can you explain this answer?
Male gametes in angiosperms are formed by the division of
[2007]
a)
generative cell
b)
vegetative cell
c)
microspore mother cell
d)
microspore.
|
Sushant Goyal answered |
Generative cell which is a cell of the male gametophyte or pollen grain in seed plants that divides to give rise directly or indirectly two sperms.
Which of the following are the important floral rewards to the animal pollinators? [2015 RS]
- a)Nectar and pollen grains.
- b)Floral fragrance and calcium crystals.
- c)Protein pellicle and stigmatic exudates.
- d)Colour and large size flower .
Correct answer is option 'A'. Can you explain this answer?
Which of the following are the important floral rewards to the animal pollinators? [2015 RS]
a)
Nectar and pollen grains.
b)
Floral fragrance and calcium crystals.
c)
Protein pellicle and stigmatic exudates.
d)
Colour and large size flower .
|
Mahesh Saini answered |
Nectar and pollen grains are the usual floral rewards which the animal pollinators get.
Additional Information:
- Flowering plants need to get pollen from one flower to another, either within a plant for self-pollination or between plants of the same species for cross-pollination to occur.
- However, pollen can't move on its own, so animals or the wind (and water in rare cases) move the pollen for plants.Many flowers use colours to attract insects, sometimes helped by coloured guiding marks. Some have ultraviolet marks that can be seen by insects but are invisible to human eyes.
- Flowers are often shaped to provide a landing platform for visiting insects or to force them to brush against anthers and stigmas.
- Some flowers have a scent to attract insects. Many of these scents are pleasing to humans too, but not all some flowers attract flies with a smell of rotting meat.
- Colours can't be seen in the dark, so scent is important for flowers that are pollinated by night-flying insects such as moths.
- Most bird-pollinated flowers have lots of nectar, often at the bottom of a tube of petals.
- Birds need to brush against anthers and stigmas when reaching for the sugary reward with their long beaks. Some birds, such as stitchbirds and bellbirds, have special brush-like tips to their tongues to help them soak up the nectar.
Hence, the correct option is A.
NCERT Reference: Page no. 30 of topic “Agents of Pollination” of chapter 2.
NCERT Reference: Page no. 30 of topic “Agents of Pollination” of chapter 2.
Which one of the following statements is not true? [2015 RS]- a)Pollen grains of some plants cause severe allergies and bronchial afflictions in some people
- b)The flowers pollinated by flies and bats secrete foul odour to attract them
- c)Honey is made by bees by digesting pollen collected from flowers
- d)Pollen grains are rich in nutrients, and they are used in the form of tablets and syrups
Correct answer is option 'C'. Can you explain this answer?
Which one of the following statements is not true? [2015 RS]
a)
Pollen grains of some plants cause severe allergies and bronchial afflictions in some people
b)
The flowers pollinated by flies and bats secrete foul odour to attract them
c)
Honey is made by bees by digesting pollen collected from flowers
d)
Pollen grains are rich in nutrients, and they are used in the form of tablets and syrups
|
|
Moumita Khanna answered |
Honey is made by nectar and pollens. Bees collect pollen and nectar in the spring when most flowers and plants are in bloom. They collect them in thier stomach but an hour, the nector mixes with the proteins and enzymes produced by bees, which convert nectar into honey.
Male gametopyte with least number of cell is present in: [2014]- a)Pteris
- b)Funaria
- c)Lilium
- d)Pinus
Correct answer is option 'C'. Can you explain this answer?
Male gametopyte with least number of cell is present in: [2014]
a)
Pteris
b)
Funaria
c)
Lilium
d)
Pinus
|
Pooja Choudhary answered |
(c) Male gametophyte is highly reduced in angiosperm and is known as pollen grain. It is 2 or 3-celled.
Plants with ovaries having only one or a few ovules, are generally pollinated by[2012M]- a)bees
- b)butterflies
- c)birds
- d)wind
Correct answer is option 'D'. Can you explain this answer?
Plants with ovaries having only one or a few ovules, are generally pollinated by
[2012M]
a)
bees
b)
butterflies
c)
birds
d)
wind
|
Sarthak Saini answered |
Wind pollinated flowers have generally single ovule in each ovary.
Nucellar polyembryony is reported in species of [2011]- a)Citrus
- b)Gossypium
- c)Triticum
- d)Brassica
Correct answer is option 'A'. Can you explain this answer?
Nucellar polyembryony is reported in species of
[2011]
a)
Citrus
b)
Gossypium
c)
Triticum
d)
Brassica
|
Yash Saha answered |
Nucellar polyembryony is reported in a Citrus species.
Megasporangium is equivalent to :[NEET 2013]- a)Fruit
- b)Nucellus
- c)Ovule
- d)Embryo sac
Correct answer is option 'C'. Can you explain this answer?
Megasporangium is equivalent to :
[NEET 2013]
a)
Fruit
b)
Nucellus
c)
Ovule
d)
Embryo sac
|
Sonal Kulkarni answered |
Ovule is also called integumented megasporangium. It develops into seed after fertilisation in spermatophytes. It occurs singly or in a cluster inside ovary with parenchymatous cushions called placenta.
Which one of the following pairs of plant structures has haploid number of chromosomes?
[2007]
- a)Egg nucleus and secondary nucleus
- b)Megaspore mother cell and antipodal cells
- c)Egg cell and antipodal cells
- d)Nucellus and antipodal cells
Correct answer is option 'C'. Can you explain this answer?
Which one of the following pairs of plant structures has haploid number of chromosomes?
[2007]
a)
Egg nucleus and secondary nucleus
b)
Megaspore mother cell and antipodal cells
c)
Egg cell and antipodal cells
d)
Nucellus and antipodal cells
|
Subham Chavan answered |
Egg nucleus and secondary nucleus has haploid number of chromosomes. While all other plant structures have diploid number of chromosomes.
Unisexuality of flowers prevents[2008]- a)autogamy, but not geitonogamy
- b)both geitonogamy and xenogamy
- c)geitonogamy, but not xenogamy
- d)autogamy and geitonogamy
Correct answer is option 'A'. Can you explain this answer?
Unisexuality of flowers prevents
[2008]
a)
autogamy, but not geitonogamy
b)
both geitonogamy and xenogamy
c)
geitonogamy, but not xenogamy
d)
autogamy and geitonogamy
|
|
Yash Saha answered |
Unisexuality of flowers prevents. autogamy, but not geitonogamy. In self fertilisation , the male and female gametes are derived from the same individual. Among plants, self fertilization also called autogamy is common in many cultivated species, eg., wheat and oats. However, self fertilization is a form of inbreeding and does not allow for the mixing of genetic material; if it occurs over a number of generations it will result in offspring being less vigorous and productive than those resulting from cross fertilization.
Wind pollinated flowers are[2010]- a)small, brightly coloured, producing large number of pollen grains
- b)small, producing large number of dry pollen grains
- c)large producing abundant nectar and pollen
- d)small, producing nectar and dry pollen
Correct answer is option 'B'. Can you explain this answer?
Wind pollinated flowers are
[2010]
a)
small, brightly coloured, producing large number of pollen grains
b)
small, producing large number of dry pollen grains
c)
large producing abundant nectar and pollen
d)
small, producing nectar and dry pollen
|
Deepak Joshi answered |
(b) Pollination by wind is called anemophily. Wind pollinated flowers are small in size, producing large number of dry pollen grains. Pollens are small, dry and light in weight. Grasses are anemophilous plants.
The hilum is a scar on the : [2015 RS]- a)Fruit, where it was attached to pedicel
- b)Fruit, where style was present
- c)Seed, where micropyle was present
- d)Seed, where funicle was attached
Correct answer is option 'D'. Can you explain this answer?
The hilum is a scar on the : [2015 RS]
a)
Fruit, where it was attached to pedicel
b)
Fruit, where style was present
c)
Seed, where micropyle was present
d)
Seed, where funicle was attached
|
Krish Chakraborty answered |
(d) The hilum is a scar found on the seed coat through which the developing seeds are attached to the fruit.
Which one of the following statements is correct? [NEET 2013]- a)Sporogenous tissue is haploid
- b)Endothecium produces the microspores
- c)Tapetum nourishes the developing pollen
- d)Hard outer layer of pollen is called intine
Correct answer is option 'C'. Can you explain this answer?
Which one of the following statements is correct? [NEET 2013]
a)
Sporogenous tissue is haploid
b)
Endothecium produces the microspores
c)
Tapetum nourishes the developing pollen
d)
Hard outer layer of pollen is called intine
|
|
Dipanjan Mehta answered |
Sporogenous tissue is always diploid, endothecium is second layer of anther wall and perform the function of protection and help in dehiscence of anther to release the pollen. Hard outer layer of pollen is called exine but tapetum always nourishes the developing pollen.
Cells of the tapetum possess dense cytoplasm and generally have more than one nucleus (polypoid).
Cells of the tapetum possess dense cytoplasm and generally have more than one nucleus (polypoid).
The scutellum observed in a grain of wheat or maize is comparable to which part of the seed in other monocotyledons?[2010]- a)Cotyledon
- b)Endosperm
- c)Aleurone layer
- d)Plumule
Correct answer is option 'A'. Can you explain this answer?
The scutellum observed in a grain of wheat or maize is comparable to which part of the seed in other monocotyledons?
[2010]
a)
Cotyledon
b)
Endosperm
c)
Aleurone layer
d)
Plumule
|
|
Mahesh Saini answered |
Scutellum is the modified cotyledon observed in a grain of wheat or maize. It lies between embryo and the endosperm.
A typical angiosperm embryo sac at maturity is: (2021)- a)7-nucleate and 7-celled
- b)8-nucleate and 8-celled
- c)8-nucleate and 7-celled
- d)7-nucleate and 8-celled
Correct answer is option 'C'. Can you explain this answer?
A typical angiosperm embryo sac at maturity is:
(2021)
a)
7-nucleate and 7-celled
b)
8-nucleate and 8-celled
c)
8-nucleate and 7-celled
d)
7-nucleate and 8-celled
|
|
Suresh Iyer answered |
Thus, hilum represents the junction between ovule and funicle. Each ovule has one or two protective envelopes called integuments. Integuments encircle the nucellus except at the tip where a small opening called the micropyle is organised. Opposite the micropylar end, is the chalaza, representing the basal part of the ovule.
In some members of which of the following pairs of families, pollen grains retain their viability for months after release? (2021)- a) Poaceae; Solanaceae
- b)Rosaceae; Leguminosae
- c)Poaceae; Rosaceae
- d)Poaceae; Leguminosae
Correct answer is option 'B'. Can you explain this answer?
In some members of which of the following pairs of families, pollen grains retain their viability for months after release?
(2021)
a)
Poaceae; Solanaceae
b)
Rosaceae; Leguminosae
c)
Poaceae; Rosaceae
d)
Poaceae; Leguminosae
|
|
Raghav Bansal answered |
In some cereals such as rice and wheat, pollen grains lose viability within 30 minutes of their release, and in some members of Rosaceae, Leguminoseae and Solanaceae, they maintain viability for months.
Which one of the following statements is correct?[NEET Kar. 2013]- a)Geitonogamy involves the pollen and stigma of flowers of different plants
- b)Cleistogamous flowers are always autogamous
- c)Xenogamy occurs only by wind pollination
- d)Chasmogamous flowers do not open at all
Correct answer is option 'B'. Can you explain this answer?
Which one of the following statements is correct?
[NEET Kar. 2013]
a)
Geitonogamy involves the pollen and stigma of flowers of different plants
b)
Cleistogamous flowers are always autogamous
c)
Xenogamy occurs only by wind pollination
d)
Chasmogamous flowers do not open at all
|
Pankaj Kulkarni answered |
Cleistogamous flowers do not expose their reproductive parts. Anthers and stigma lie close to each other. Pure autogamy occurs since there is no chance of crosspollination. Cleistogamy is the most efficient floral adaptation for promoting self-pollination. E.g., Viola mirabilis and Oxalis autosella.
Perisperm differs from endosperm in;[NEET 2013]- a)having no reserve food
- b)being a diploid tissue
- c)its formatting by fusion of secondar y nucleus with several sperms
- d)being a haploid tissue
Correct answer is option 'B'. Can you explain this answer?
Perisperm differs from endosperm in;
[NEET 2013]
a)
having no reserve food
b)
being a diploid tissue
c)
its formatting by fusion of secondar y nucleus with several sperms
d)
being a haploid tissue
|
|
Pankaj Kulkarni answered |
Perisperm is remnants of nucellus which is diploid (2n) but endosperm is triploid (3n). Perisperm occurs in the seeds of Black pepper, coffee, castor, cardamum, Nymphaea. Endosperm is the food laden tissue which is meant for nourishing the embryo in seed plants. In angiosperms the endosperm is formed as a result of vegetative fertilization, triple fusion or fusion of a male gamete with diploid secondary nucleus of the central cell.
In water hyacinth and water lily, pollination takes place by: (2020)- a)wind and water
- b)insects and water
- c)insects or wind
- d)water currents only
Correct answer is option 'C'. Can you explain this answer?
In water hyacinth and water lily, pollination takes place by:
(2020)
a)
wind and water
b)
insects and water
c)
insects or wind
d)
water currents only
|
Dev Patel answered |
In a majority of aquatic plants such as water hyacinth and water lily, the flowers emerge above the level of water and are pollinated by insects or wind as in most of the land plants. Their stem part which is above the thalamus is not in the water. The pollen grains are in the upper part of thalamus so pollination can't done by water. That's why it is done by insects and wind.
What is the function of germ pore?[2012M]- a)Emergence of radicle
- b)Absorption of water for seed germination
- c)Initiation of pollen tube
- d)Release of male gametes
Correct answer is option 'C'. Can you explain this answer?
What is the function of germ pore?
[2012M]
a)
Emergence of radicle
b)
Absorption of water for seed germination
c)
Initiation of pollen tube
d)
Release of male gametes
|
|
Deepak Joshi answered |
The germ pores are apertures in the exine layer of the pollen grain where the sporopollenin is absent. The germ pore helps in the formation of the germ tube or pollen tube and which makes its exit on germination.
What type of pollination takes place in Vallisneria? (2019)- a)Pollination occurs in submerged condition by water.
- b)Flowers emerge above surface of water and pollination occurs by insects.
- c)Flowers emerge above water surface, pollen is carried by wind.
- d)Male flowers are carried by water currents to female flowers at surface of water.
Correct answer is option 'D'. Can you explain this answer?
What type of pollination takes place in Vallisneria?
(2019)
a)
Pollination occurs in submerged condition by water.
b)
Flowers emerge above surface of water and pollination occurs by insects.
c)
Flowers emerge above water surface, pollen is carried by wind.
d)
Male flowers are carried by water currents to female flowers at surface of water.
|
|
Gaurav Kumar answered |
- Vallisneria is an aquatic plant. In case of Vallisneria water is the agent for cross pollination.
- In female Vallisneria, the flower reaches to the surface of water by the long stalk and the male flower or pollen grains are released into the surface of water.
- Female flowers or stigma carried them by water current.
- Some of them eventually reach the female flowers and the stigma.
Hence, the correct option is C.
NCERT Reference: Page no. 29 of topic “Agents of Pollination” of chapter 2.
NCERT Reference: Page no. 29 of topic “Agents of Pollination” of chapter 2.
Both, autogamy and geitonogamy are prevented in[2012]- a)Papaya
- b)Cucumber
- c)Castor
- d)Maize
Correct answer is option 'A'. Can you explain this answer?
Both, autogamy and geitonogamy are prevented in
[2012]
a)
Papaya
b)
Cucumber
c)
Castor
d)
Maize
|
|
Nilotpal Gupta answered |
Autogamy involves pollination within the same flower, while geitonogamy involves transfer of pollen grains from the anther of one flower to the stigma of another flower of the same plant. Both the process are prevented in papaya because it is dioecious plant(i.e, male and female sex organs are borne on separate plants) and it always needs cross-pollination.
Double fertilisation is (2018)- a)Fusion of two male gametes of a pollen tube with two different eggs
- b)Fusion of one male gamete with two polar nuclei
- c)Fusion of two male gametes with one egg
- d)Syngamy and triple fusion.
Correct answer is option 'D'. Can you explain this answer?
Double fertilisation is
(2018)
a)
Fusion of two male gametes of a pollen tube with two different eggs
b)
Fusion of one male gamete with two polar nuclei
c)
Fusion of two male gametes with one egg
d)
Syngamy and triple fusion.
|
Ananya Das answered |
- Double fertilisation is unique and universal feature of angiosperms. Total number of nuclei involved in double fertilisation is five, i.e., 2 in syngamy and 3 in triple fusion.
- Syngamy is fusion of one male gamete with egg to form zygote.
- Triple fusion occurs when the second male gamete with 2 polar nuclei or secondary nucleus to form triploid primary endosperm nucleus.
In which one of the following pollination is autogamous?[2011]- a)Geitonogamy
- b)Xenogamy
- c)Chasmogamy
- d)Cleistogamy
Correct answer is option 'D'. Can you explain this answer?
In which one of the following pollination is autogamous?
[2011]
a)
Geitonogamy
b)
Xenogamy
c)
Chasmogamy
d)
Cleistogamy
|
|
Dipanjan Mehta answered |
Cleistogamy is autogamous pollination. When pollination and fertilization occur in unopened flower bud, it is known as cleistogamy. It ensures self-pollination and prevents cross-pollination.
Which one of the following, both autogamy and geitonogamy are prevented? (2019)- a)Wheat
- b)Papaya
- c)Castor
- d)Maize
Correct answer is option 'B'. Can you explain this answer?
Which one of the following, both autogamy and geitonogamy are prevented?
(2019)
a)
Wheat
b)
Papaya
c)
Castor
d)
Maize
|
|
Riya Banerjee answered |
Autogamy and geitonogamy are two forms of self-pollination. In autogamy, pollen falls on stigma of the same flower. While in geitonogamy pollens from a flower fall on the stigma of some other flower on the same plant. Papaya is a dioecious plant thus both autogamy and geitonogamy are prevented in it.
Which of the following has proved helpful in preserving pollen as fossils? (2018)- a)Pollenkitt
- b)Cellulosic intine
- c)Oil content
- d)Sporopollenin
Correct answer is option 'D'. Can you explain this answer?
Which of the following has proved helpful in preserving pollen as fossils?
(2018)
a)
Pollenkitt
b)
Cellulosic intine
c)
Oil content
d)
Sporopollenin
|
Jyoti Sengupta answered |
Exine of pollen grain is made up of highly resistant fatty substance called sporopollenin, which is not degraded by any enzyme. It is not affected by high temperature, strong acid or strong alkali. Because of the sporopollenin, pollen grains are well preserved as microfossils.
The arrangement of the nuclei in a normal embryo sac in the dicot plants is[2006]- a)3 + 2 + 3
- b)2 + 3 + 3
- c)3 + 3 + 2
- d)2 + 4 + 2
Correct answer is option 'A'. Can you explain this answer?
The arrangement of the nuclei in a normal embryo sac in the dicot plants is
[2006]
a)
3 + 2 + 3
b)
2 + 3 + 3
c)
3 + 3 + 2
d)
2 + 4 + 2
|
Subhankar Datta answered |
In a dicot plant general arrangement of nuclei in the embryosac is that 3 nuclei in 3 cells of egg apparatus (one egg cell & 2 synergids) at micropylar end and 2 polar nuclei in almost middle region and 3 nuclei in the form of antipodals at the distal end from micropyle, towards nucellus. So total nuclei 3 + 2 + 3.
What is the function of tassels in the corn cob? (NEET 2023)- a)To attract insects
- b)To trap pollen grains
- c)To disperse pollen grains
- d)To protect seeds
Correct answer is option 'B'. Can you explain this answer?
What is the function of tassels in the corn cob? (NEET 2023)
a)
To attract insects
b)
To trap pollen grains
c)
To disperse pollen grains
d)
To protect seeds
|
Ciel Knowledge answered |
Tassels in the corn cob represents stigma and style which wave in the wind to trap pollen grains.
In a flowering plant, archesporium gives rise to [2003]- a)Only tapetum and sporogenous cells
- b)Only the wall of the sporangium
- c)Both wall and the sporogenous cells
- d)Wall and the tapetum
Correct answer is option 'C'. Can you explain this answer?
In a flowering plant, archesporium gives rise to [2003]
a)
Only tapetum and sporogenous cells
b)
Only the wall of the sporangium
c)
Both wall and the sporogenous cells
d)
Wall and the tapetum
|
|
Prasad Das answered |
Understanding Archesporium in Flowering Plants
The archesporium is a crucial structure in the development of reproductive organs in flowering plants. It plays a significant role in the formation of both the spores and the surrounding tissues.
Key Functions of Archesporium:
- Sporogenous Cells:
The archesporium primarily gives rise to sporogenous cells, which are responsible for producing the microspores or megaspores through meiosis. These spores eventually develop into pollen grains or ovules.
- Tapetum Formation:
Additionally, the archesporium contributes to the formation of the tapetum, a layer of cells that nourishes the developing spores. The tapetum provides essential nutrients and hormones, ensuring proper maturation of the spores.
- Wall of the Sporangium:
The archesporium also contributes to the formation of the wall of the sporangium, which encases the sporogenous cells. This protective layer is crucial for the integrity and function of the sporangium during the development of spores.
Conclusion:
In summary, the correct answer is option 'C', indicating that the archesporium gives rise to both the wall of the sporangium and the sporogenous cells. This dual function emphasizes the importance of archesporium in the reproductive process of flowering plants, facilitating the development of both structural and functional components necessary for reproduction.
The archesporium is a crucial structure in the development of reproductive organs in flowering plants. It plays a significant role in the formation of both the spores and the surrounding tissues.
Key Functions of Archesporium:
- Sporogenous Cells:
The archesporium primarily gives rise to sporogenous cells, which are responsible for producing the microspores or megaspores through meiosis. These spores eventually develop into pollen grains or ovules.
- Tapetum Formation:
Additionally, the archesporium contributes to the formation of the tapetum, a layer of cells that nourishes the developing spores. The tapetum provides essential nutrients and hormones, ensuring proper maturation of the spores.
- Wall of the Sporangium:
The archesporium also contributes to the formation of the wall of the sporangium, which encases the sporogenous cells. This protective layer is crucial for the integrity and function of the sporangium during the development of spores.
Conclusion:
In summary, the correct answer is option 'C', indicating that the archesporium gives rise to both the wall of the sporangium and the sporogenous cells. This dual function emphasizes the importance of archesporium in the reproductive process of flowering plants, facilitating the development of both structural and functional components necessary for reproduction.
Persistent nucellus in the seed is known as: (2019)- a)Tegmen
- b)Chalaza
- c)Perisperm
- d)Hilum
Correct answer is option 'C'. Can you explain this answer?
Persistent nucellus in the seed is known as: (2019)
a)
Tegmen
b)
Chalaza
c)
Perisperm
d)
Hilum
|
Aditya Mehta answered |
The correct answer is option 'C', Perisperm.
Explanation:
- A seed typically consists of three main parts - the embryo, endosperm, and seed coat.
- The embryo is the tiny plant inside the seed that will grow into a new plant.
- The endosperm is a source of nutrients for the developing embryo, and it is usually the largest part of the seed.
- The seed coat is the outer covering of the seed that protects the embryo and endosperm.
- In some seeds, there is an additional tissue called the perisperm.
- The perisperm is formed from the persistent nucellus, which is the tissue that surrounds and nourishes the embryo sac during development.
- In some seeds, the perisperm remains after the endosperm has been used up, and it continues to provide nutrients to the developing embryo.
- The perisperm is often found in seeds of monocotyledonous plants, such as corn, rice, and wheat.
Therefore, persistent nucellus in the seed is known as Perisperm.
Explanation:
- A seed typically consists of three main parts - the embryo, endosperm, and seed coat.
- The embryo is the tiny plant inside the seed that will grow into a new plant.
- The endosperm is a source of nutrients for the developing embryo, and it is usually the largest part of the seed.
- The seed coat is the outer covering of the seed that protects the embryo and endosperm.
- In some seeds, there is an additional tissue called the perisperm.
- The perisperm is formed from the persistent nucellus, which is the tissue that surrounds and nourishes the embryo sac during development.
- In some seeds, the perisperm remains after the endosperm has been used up, and it continues to provide nutrients to the developing embryo.
- The perisperm is often found in seeds of monocotyledonous plants, such as corn, rice, and wheat.
Therefore, persistent nucellus in the seed is known as Perisperm.
In some plants, the thalamus contributes to fruit formation. Such fruits are termed as: (2020)- a)False fruits
- b)Aggregate fruits
- c)True fruits
- d)Parthenocarpic fruits
Correct answer is option 'A'. Can you explain this answer?
In some plants, the thalamus contributes to fruit formation. Such fruits are termed as: (2020)
a)
False fruits
b)
Aggregate fruits
c)
True fruits
d)
Parthenocarpic fruits
|
|
Shalini Chauhan answered |
Thalamus and Fruit Formation
The thalamus, also known as the receptacle, is an important part of the flower that plays a crucial role in fruit formation. It is the enlarged tip of the flower stalk where all the floral parts, such as sepals, petals, stamens, and pistils, are attached. The thalamus provides support and protection to the developing ovary, which eventually matures into a fruit. The specific contribution of the thalamus to fruit formation depends on the type of fruit it produces.
Types of Fruits
There are several types of fruits based on their origin and development. Some of the common types include true fruits, false fruits, aggregate fruits, and parthenocarpic fruits.
True Fruits:
True fruits are formed from the fertilized ovary of a flower. After pollination, the pollen grain germinates on the stigma and produces a pollen tube. This tube carries the male gametes to the ovule, where fertilization takes place. The fertilized ovule develops into a seed, and the ovary surrounding the seed matures into a fruit. In true fruits, the thalamus does not significantly contribute to fruit formation.
False Fruits:
In some plants, the thalamus plays a significant role in fruit formation. These fruits are known as false fruits or pseudocarps. In false fruits, the thalamus, along with other floral parts, contributes to the structure and development of the fruit. The thalamus may enlarge and become fleshy, forming a part of the fruit. Examples of false fruits include apple, pear, and strawberry. These fruits are derived from the thalamus and not the ovary.
Aggregate Fruits:
Aggregate fruits are formed from multiple separate carpels of a single flower. Each carpel develops into a small fruit, and all the fruits are clustered together on the thalamus. Each individual fruit in an aggregate fruit is derived from a separate ovary, while the thalamus remains as a common receptacle. Examples of aggregate fruits include raspberry and blackberry.
Parthenocarpic Fruits:
Parthenocarpic fruits are formed without fertilization. In these fruits, the ovary develops into a fruit without the occurrence of pollination and fertilization. The thalamus may or may not contribute to fruit formation in parthenocarpic fruits, as their development is not dependent on pollination. Examples of parthenocarpic fruits include bananas and seedless grapes.
Therefore, in some plants, where the thalamus contributes to fruit formation, the fruits are termed as false fruits or pseudocarps. These fruits are derived from the thalamus and not the ovary, unlike true fruits.
The thalamus, also known as the receptacle, is an important part of the flower that plays a crucial role in fruit formation. It is the enlarged tip of the flower stalk where all the floral parts, such as sepals, petals, stamens, and pistils, are attached. The thalamus provides support and protection to the developing ovary, which eventually matures into a fruit. The specific contribution of the thalamus to fruit formation depends on the type of fruit it produces.
Types of Fruits
There are several types of fruits based on their origin and development. Some of the common types include true fruits, false fruits, aggregate fruits, and parthenocarpic fruits.
True Fruits:
True fruits are formed from the fertilized ovary of a flower. After pollination, the pollen grain germinates on the stigma and produces a pollen tube. This tube carries the male gametes to the ovule, where fertilization takes place. The fertilized ovule develops into a seed, and the ovary surrounding the seed matures into a fruit. In true fruits, the thalamus does not significantly contribute to fruit formation.
False Fruits:
In some plants, the thalamus plays a significant role in fruit formation. These fruits are known as false fruits or pseudocarps. In false fruits, the thalamus, along with other floral parts, contributes to the structure and development of the fruit. The thalamus may enlarge and become fleshy, forming a part of the fruit. Examples of false fruits include apple, pear, and strawberry. These fruits are derived from the thalamus and not the ovary.
Aggregate Fruits:
Aggregate fruits are formed from multiple separate carpels of a single flower. Each carpel develops into a small fruit, and all the fruits are clustered together on the thalamus. Each individual fruit in an aggregate fruit is derived from a separate ovary, while the thalamus remains as a common receptacle. Examples of aggregate fruits include raspberry and blackberry.
Parthenocarpic Fruits:
Parthenocarpic fruits are formed without fertilization. In these fruits, the ovary develops into a fruit without the occurrence of pollination and fertilization. The thalamus may or may not contribute to fruit formation in parthenocarpic fruits, as their development is not dependent on pollination. Examples of parthenocarpic fruits include bananas and seedless grapes.
Therefore, in some plants, where the thalamus contributes to fruit formation, the fruits are termed as false fruits or pseudocarps. These fruits are derived from the thalamus and not the ovary, unlike true fruits.
Which one of the following statements is wrong?[2012M]- a)When pollen is shed at two-celled stage, double fertilization does not take place.
- b)Vegetative cell is larger than generative cell.
- c)Pollen g rains in some plants remain viable for months.
- d)Intine is made up of cellulose and - pectin.
Correct answer is option 'A'. Can you explain this answer?
Which one of the following statements is wrong?
[2012M]
a)
When pollen is shed at two-celled stage, double fertilization does not take place.
b)
Vegetative cell is larger than generative cell.
c)
Pollen g rains in some plants remain viable for months.
d)
Intine is made up of cellulose and - pectin.
|
|
Rithika Bajaj answered |
Understanding Pollen Development and Double Fertilization
When analyzing the statements regarding pollen and fertilization, it's essential to understand the concepts of pollen development and the fertilization process in plants.
Statement Analysis
- Statement A: When pollen is shed at two-celled stage, double fertilization does not take place.
- This statement is incorrect. In flowering plants, pollen grains can reach the stigma in a two-celled stage, where one cell becomes the tube cell and the other develops into the generative cell. The generative cell eventually divides to form two sperm cells. Double fertilization occurs when one sperm fertilizes the egg and the other fuses with the polar nuclei, forming the triploid endosperm. Thus, double fertilization can and does take place even if the pollen is shed in a two-celled state.
- Statement B: Vegetative cell is larger than generative cell.
- This statement is true. The vegetative cell (or tube cell) is indeed larger than the generative cell.
- Statement C: Pollen grains in some plants remain viable for months.
- This statement is also true. Certain species, like conifers, have pollen grains that can remain viable for extended periods, sometimes months or even years.
- Statement D: Intine is made up of cellulose and pectin.
- This statement is accurate. The intine, which is the inner layer of the pollen wall, is composed of cellulose and pectin.
Conclusion
Based on the analysis, the correct answer is indeed option 'A' since it misrepresents the capability of double fertilization occurring from two-celled pollen. Understanding these concepts helps clarify the reproductive strategies of flowering plants.
When analyzing the statements regarding pollen and fertilization, it's essential to understand the concepts of pollen development and the fertilization process in plants.
Statement Analysis
- Statement A: When pollen is shed at two-celled stage, double fertilization does not take place.
- This statement is incorrect. In flowering plants, pollen grains can reach the stigma in a two-celled stage, where one cell becomes the tube cell and the other develops into the generative cell. The generative cell eventually divides to form two sperm cells. Double fertilization occurs when one sperm fertilizes the egg and the other fuses with the polar nuclei, forming the triploid endosperm. Thus, double fertilization can and does take place even if the pollen is shed in a two-celled state.
- Statement B: Vegetative cell is larger than generative cell.
- This statement is true. The vegetative cell (or tube cell) is indeed larger than the generative cell.
- Statement C: Pollen grains in some plants remain viable for months.
- This statement is also true. Certain species, like conifers, have pollen grains that can remain viable for extended periods, sometimes months or even years.
- Statement D: Intine is made up of cellulose and pectin.
- This statement is accurate. The intine, which is the inner layer of the pollen wall, is composed of cellulose and pectin.
Conclusion
Based on the analysis, the correct answer is indeed option 'A' since it misrepresents the capability of double fertilization occurring from two-celled pollen. Understanding these concepts helps clarify the reproductive strategies of flowering plants.
Identify the set of correct statements:
A. The flowers of Vallisneria are colourful and produce nectar.
B. The flowers of water lily are not pollinated by water.
C. In most of water-pollinated species, the pollen grains are protected from wetting.
D. Pollen grains of some hydrophytes are long and ribbon like.
E. In some hydrophytes, the pollen grains are carried passively inside water.
Choose the correct answer from the options given below. (2024)- a)C, D and E only
- b)A, B, C and D only
- c)A, C, D and E only
- d)B, C, D and E only
Correct answer is option 'D'. Can you explain this answer?
Identify the set of correct statements:
A. The flowers of Vallisneria are colourful and produce nectar.
B. The flowers of water lily are not pollinated by water.
C. In most of water-pollinated species, the pollen grains are protected from wetting.
D. Pollen grains of some hydrophytes are long and ribbon like.
E. In some hydrophytes, the pollen grains are carried passively inside water.
Choose the correct answer from the options given below. (2024)
A. The flowers of Vallisneria are colourful and produce nectar.
B. The flowers of water lily are not pollinated by water.
C. In most of water-pollinated species, the pollen grains are protected from wetting.
D. Pollen grains of some hydrophytes are long and ribbon like.
E. In some hydrophytes, the pollen grains are carried passively inside water.
Choose the correct answer from the options given below. (2024)
a)
C, D and E only
b)
A, B, C and D only
c)
A, C, D and E only
d)
B, C, D and E only
|
|
Ciel Knowledge answered |
- Statement A: False. Vallisneria is a water-pollinated plant, and its flowers are small, inconspicuous, and do not produce nectar or have bright colors, as these are not required for hydrophily.
- Statement B: True. Water lilies are not pollinated by water. Instead, their flowers are above water and rely on insects for pollination.
- Statement C: True. In most water-pollinated species, pollen grains have a protective mucilaginous coating to prevent them from getting wet and disintegrating in water.
- Statement D: True. In hydrophilous plants like Zostera, pollen grains are long and ribbon-like, which helps them float and move effectively in water currents.
- Statement E: True. In some hydrophilous plants, pollen grains are passively carried by water currents to facilitate pollination, as seen in Vallisneria.
Correct Answer: Option D (B, C, D, and E only)
Reason: Statements B, C, D, and E are true, while Statement A is false because Vallisneria flowers are neither colorful nor nectar-producing.
Topic in NCERT: Pollination by Water
Line in NCERT: "In most of the water-pollinated species, pollen grains are protected from wetting by a mucilaginous covering." "Pollen grains of some hydrophytes are long, ribbon like and they are carried passively inside the water." "In another group of water pollinated plants such as seagrasses, female flowers remain submerged in water and the pollen grains are released inside the water."
Reason: Statements B, C, D, and E are true, while Statement A is false because Vallisneria flowers are neither colorful nor nectar-producing.
Topic in NCERT: Pollination by Water
Line in NCERT: "In most of the water-pollinated species, pollen grains are protected from wetting by a mucilaginous covering." "Pollen grains of some hydrophytes are long, ribbon like and they are carried passively inside the water." "In another group of water pollinated plants such as seagrasses, female flowers remain submerged in water and the pollen grains are released inside the water."
Flowers with both androecium and gynoecium are called- a)Bisexual flowers
- b)Anther
- c)Stamens
- d)Unisexual flowers
Correct answer is option 'A'. Can you explain this answer?
Flowers with both androecium and gynoecium are called
a)
Bisexual flowers
b)
Anther
c)
Stamens
d)
Unisexual flowers
|
Nilesh Nambiar answered |
Understanding Flower Structure
Flowers are the reproductive structures of flowering plants, and they play a crucial role in the plant's life cycle. They consist of various parts, including the androecium and gynoecium.
Androecium Explained
- The androecium is the male part of the flower, consisting of stamens.
- Each stamen is made up of an anther and a filament, where pollen grains are produced.
Gynoecium Explained
- The gynoecium is the female part of the flower, consisting of one or more carpels.
- It includes the ovary, style, and stigma, where ovules are produced and fertilization occurs.
Bisexual Flowers
- Bisexual flowers, also known as perfect flowers, contain both the androecium and gynoecium.
- This means they have the capacity to produce both male and female gametes, allowing for self-pollination and cross-pollination.
Unisexual Flowers
- In contrast, unisexual flowers contain either the androecium or the gynoecium, but not both.
- Male flowers have only stamens, while female flowers have only carpels.
Conclusion
- The presence of both androecium and gynoecium in a flower is what defines it as bisexual.
- This duality enhances the reproductive success of plants, making option 'A' the correct answer.
Understanding flower structures is essential in botany, especially for exams like NEET, as it helps in comprehending plant reproduction and diversity.
Flowers are the reproductive structures of flowering plants, and they play a crucial role in the plant's life cycle. They consist of various parts, including the androecium and gynoecium.
Androecium Explained
- The androecium is the male part of the flower, consisting of stamens.
- Each stamen is made up of an anther and a filament, where pollen grains are produced.
Gynoecium Explained
- The gynoecium is the female part of the flower, consisting of one or more carpels.
- It includes the ovary, style, and stigma, where ovules are produced and fertilization occurs.
Bisexual Flowers
- Bisexual flowers, also known as perfect flowers, contain both the androecium and gynoecium.
- This means they have the capacity to produce both male and female gametes, allowing for self-pollination and cross-pollination.
Unisexual Flowers
- In contrast, unisexual flowers contain either the androecium or the gynoecium, but not both.
- Male flowers have only stamens, while female flowers have only carpels.
Conclusion
- The presence of both androecium and gynoecium in a flower is what defines it as bisexual.
- This duality enhances the reproductive success of plants, making option 'A' the correct answer.
Understanding flower structures is essential in botany, especially for exams like NEET, as it helps in comprehending plant reproduction and diversity.
Advantage of cleistogamy is :[NEET 2013]- a)More vigorous offspring
- b)No dependence of pollinators
- c)Vivipary
- d)Higher genetic variability
Correct answer is option 'B'. Can you explain this answer?
Advantage of cleistogamy is :
[NEET 2013]
a)
More vigorous offspring
b)
No dependence of pollinators
c)
Vivipary
d)
Higher genetic variability
|
Soumya Ahuja answered |
Cleistogamy favours no dependence on pollinator because flowers never open. In such flowers, the anthers and stigma lie close to each other. When anthers dehisce in flower buds pollen grains come in contact with the stigma to effect pollination.
What does the filiform apparatus do at the entrance into ovule?[2008]- a)It helps in the entry of pollen tube into a synergid
- b)It prevents entry of more than one pollen tube into the embryo sac
- c)It brings about opening of the pollen tube
- d)It guides pollen tube from a synergid to egg
Correct answer is option 'A'. Can you explain this answer?
What does the filiform apparatus do at the entrance into ovule?
[2008]
a)
It helps in the entry of pollen tube into a synergid
b)
It prevents entry of more than one pollen tube into the embryo sac
c)
It brings about opening of the pollen tube
d)
It guides pollen tube from a synergid to egg
|
|
Subhankar Datta answered |
Filiform apparatus helps in the entry of pollen tube into a synergid in ovule. Filiform apparatus is in form of finger like projection comprising a core of micro fibrils enclosed in a sheath. The filiform apparatus resembles transfer cells" meant for short distance movement of metabolites. The filiform apparatus responsible for the absorption of food from the nucleus.
Identify the incorrect statement related to Pollination: (NEET 2022)- a)Flowers produce, foul odours to attract flies and beetles to get pollinated.
- b)Moths and butterflies are the most dominant pollinating agents among insects.
- c)Pollination by water is quite rare in flowering plants.
- d)Pollination by wind is more common amongst abiotic pollination.
Correct answer is option 'B'. Can you explain this answer?
Identify the incorrect statement related to Pollination: (NEET 2022)
a)
Flowers produce, foul odours to attract flies and beetles to get pollinated.
b)
Moths and butterflies are the most dominant pollinating agents among insects.
c)
Pollination by water is quite rare in flowering plants.
d)
Pollination by wind is more common amongst abiotic pollination.
|
Stepway Academy answered |
Among the animals, insects, particularly bees are the dominant biotic pollinating agents.
Topic in NCERT: Agents of Pollination
Line in NCERT: "Among the animals, insects, particularly bees are the dominant biotic pollinating agents."
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