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Test: Sexual Reproduction in Flowering Plants - 2 - NEET MCQ


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25 Questions MCQ Test Biology Class 12 - Test: Sexual Reproduction in Flowering Plants - 2

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Test: Sexual Reproduction in Flowering Plants - 2 - Question 1

Label the part marked with a blue arrow.
Nucellus made up of cushiony cells helps in the nourishment of the embryo sac

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 1
  • It’s the nucellus. Nucellus is the place where the embryo sac rests.
  • It is made up of cushiony cells called parenchymatous cells.
  • Nucellus helps in the nourishment of the embryo sac.
Test: Sexual Reproduction in Flowering Plants - 2 - Question 2

Label the part marked in blue arrow.
Polar nuclei undergo double fertilization female gametophytes fuse with male gametophytes

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 2
  • Polar nuclei are 2 haploid cells.
  • Either one of them will fuse with a male haploid cell to form an endosperm.
  • They undergo the process of double fertilization–2 female gametophytes fuse with 2 male gametophytes.
Test: Sexual Reproduction in Flowering Plants - 2 - Question 3

Label the part marked by the blue arrow.

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 3
  • They are the 3 mature cells in the embryo sac present opposite to the micropylar end.
  • The function of the antipodal cells is to provide nutrition and nourishment to the embryo sac.
Test: Sexual Reproduction in Flowering Plants - 2 - Question 4

How do the top three layers assist in developing anthers?

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 4

The microsporangial wall’s outer three layers—the epidermis, endothecium, and middle layers—help to shield developing anthers and act as a mechanism for dehiscence in adult anthers.

Test: Sexual Reproduction in Flowering Plants - 2 - Question 5

Following the establishment of the endosperm, ___ split.

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 5
  • Zygotes split following endosperm development.
  • The zygote cannot sustain itself by nourishment, hence the explanation.
  • It needs endosperm to get its nourishment. It is a modification.
Test: Sexual Reproduction in Flowering Plants - 2 - Question 6

Identify “A” and “B” in the T.S of mature anther:

    

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 6

The mature anther consists of four microsporangia which contain four layers. The inner most layer is called tapetum that provide nutrient to growing microspores and tissues inside it are called microspore mother cell that produce pollen grain.

Test: Sexual Reproduction in Flowering Plants - 2 - Question 7

How many meiotic divisions are required to form 64 pollen grains? 

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 7

Each microspore mother cell produces four pollen grains by reduction division. Hence to produce 64 pollen grains 16 meiotic or reduction division is required.

Test: Sexual Reproduction in Flowering Plants - 2 - Question 8

Filiform apparatus present at micropylar part of the Synergids help in: 

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 8

Filiform apparatus is finger-like projection attached with egg apparatus. This apparatus guide the pollen tube carrying male gametes for facilitating Syngamy.

Test: Sexual Reproduction in Flowering Plants - 2 - Question 9

What happen to haploid megaspores formed by megaspore mother cell in an angiospermic plant? 

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 9

Each Sporogenous cell under meiotic division to form tetrad of megaspores. The three megaspores degenerate and only one megaspore develops into embryo sac or female gametophyte.

Test: Sexual Reproduction in Flowering Plants - 2 - Question 10

Assertion: The innermost layer of microsporangium is called tapetum.
Reason: Tapetum performs the function of protection and help in dehiscence of anther to release pollen grains.  

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 10

Microsporangium is surrounded by four wall layers. The innermost layer is tapetum. Tapetum nourishes the developing pollens. The three outer walls provide protection and help in dehiscence of anther to release pollen grains.

Test: Sexual Reproduction in Flowering Plants - 2 - Question 11

A bilobed dithecous anther had 50 microspore mother cells per microsporangium. How many male gametes this anther can produce?  

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 11

Each microspore mother produces 4 pollen grains by reduction division. Bilobed dithecious have four microsporangium.

Therefore,

50 x 4 x 4

= 800 male gametes are formed.

Test: Sexual Reproduction in Flowering Plants - 2 - Question 12

Pollen grain of large number of species can be stored in:  

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 12

Pollen grain consists of hard covering of exine but their viability may lost with time. For Hybridisation pollen grains are collected and stored in liquid nitrogen below -196 degree Celsius temperature.

Test: Sexual Reproduction in Flowering Plants - 2 - Question 13

In nature, inbreeding and out breeding of plants is regulated by------?

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 13

Inbreeding occurs in intraspecific flowers as contain same kinds of genetic materials. Outbreeding takes place between interspecific flowers having different kinds of genetic materials.

Test: Sexual Reproduction in Flowering Plants - 2 - Question 14

Continued self-pollination results in inbreeding depression as they------?

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 14

Self-pollination involves transfer of pollen grain from anther to stigma of same flower. The two fusing gametes are genetically similar to each other as they are produced by same plant. Continued self –pollination results into pure line and breeding depression.

Test: Sexual Reproduction in Flowering Plants - 2 - Question 15

Abundant occurrence of fossilized pollen grain is due to resistant: 

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 15

Large amount of fossilized pollen grain are found during excavation process of older parts due to tough covering of Sporopollenin that make the outer wall of pollen grain, exine. This substance cannot be hydrolyzed by any enzyme known.

Test: Sexual Reproduction in Flowering Plants - 2 - Question 16

At the _______ end, embryogenesis happens.

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 16
  • Embryogeny is the study of the changes that take place when an embryo develops from a zygote.
  • It occurs near the embryo sac’s micropylar end.
  • The nucellus and integuments unite at the base of the ovule, or chalaza, in plants.
  • It can be found on an ovule opposite the micropylar end.
  • Chalaza is the pathway via which plant nutrients are delivered to the nucellus.
  • Three antipodal cells form from the chalazal end of the embryo sac’s cells.
Test: Sexual Reproduction in Flowering Plants - 2 - Question 17

The correct sequence of parts of female reproductive organ in plants

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 17
  • Stigma - It is the head of the pistil.
    • It receives pollen, which begins the process of fertilization.
  • Style - It the stalk of the pistil.
    • It is a long, slender stalk that connects the stigma and the ovary. 
    • When pollen reaches the stigma, it begins to grow a tube through the style called a pollen tube, which eventually reaches the ovary.
  • Ovary - It is the base of the pistil.
    • It holds the ovules for fertilization.
  • Thalamus - It is present near the stalk of the flower.
    • It supplies nutrients to the flower.
    • It is a condensed axis of the flower from which all floral parts arise.

Test: Sexual Reproduction in Flowering Plants - 2 - Question 18

If an endosperm cell of angiosperm contain 24 chromosome, the number of chromosome in each cell of root is?  

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 18

Endosperm cells are triploid as they are formed by triple fission of two polar nuclei and one male gamete. So, haploid cell will contain 8 chromosomes only. Root cells are diploid. Hence root cell will contain 16 chromosomes.

Test: Sexual Reproduction in Flowering Plants - 2 - Question 19

The meiocyte of an onion plant contains 32 chromosomes. Calculate the number of chromosomes found in its endosperm?

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 19

The meiocytecell are diploid so, haploid cell will contain 16 chromosomes. The endosperm cell are formed by fusion of two polar nuclei and one male gametes so, endosperm cells are triploid that will contain 16x3= 48 chromosomes.

Test: Sexual Reproduction in Flowering Plants - 2 - Question 20

Epiblast present in certain monocot embryo represents--------?

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 20

Embryo of certain monocotyledonous seeds contain additional cotyledon besides one present in al monocots. This cotyledon represents the evolutionary stage of cotyledon formation from one to two.

Test: Sexual Reproduction in Flowering Plants - 2 - Question 21

A typical angiospemic embryo sac is though 8 nucleate is 7-celled. 8 nuclei includes______.

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 21

The female gametophyte (embryo sac) develops from a single functional megaspore. This megaspore undergoes three successive mitotic divisions to form eight nucleate embryo sacs.

The first mitotic division in the megaspore forms two nuclei. One nucleus moves towards the micropylar end while the other nucleus moves towards the chalazal end. Then, these nuclei divide at their respective ends and re-divide to form eight nucleate stages. As a result, there are four nuclei each at both the ends i.e., at the micropylar and the chalazal end in the embryo sac. At the micropylar end, out of the four nuclei only three differentiate into two synergids and one egg cell. Together they are known as the egg apparatus. Similarly, at the chalazal end, three out of four nuclei differentiates as antipodal cells. The remaining two cells (of the micropylar and the chalazal end) move towards the centre and are known as the polar nuclei, which are situated in a large central cell. Hence, at maturity, the female gametophyte appears as a 7-celled structure, though it has 8 nucleate.

Test: Sexual Reproduction in Flowering Plants - 2 - Question 22

The major approach towards the crop improvement programme is______.

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 22

Crop improvement programme is carried out to obtain crops with desired traits that may be more yields, resistance to disease, higher nutrient value etc. Two plants having desired traits are hybridized to obtain combination of desired traits.

Test: Sexual Reproduction in Flowering Plants - 2 - Question 23

Which of the following parts of a plant take part in sexual reproduction?

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 23

About Plant Reproduction:

  • Sexual Reproduction is defined as the production of a (New organism) from Two-parents by using their (Gametes or Sex cells).
  • Plants also have Male and Female sex organs.
  • These plants are called (Angiosperms or Flowering plants) as they reproduce by the Sexual reproduction method. 
  • Most of the plants contain Reproductive organs of both (Males and Females) in the flowers.
  • The (Male organ part) of a flower is called the (Stamen) and the (Female organ part) of a flower is called (Carpel).
  • These Pollen Grains help in making (Male Gametes) of the plant and are present in Anther.
  • The (Male Gametes) fertilize the (Female Gametes).
  • The fertilized (Egg cells) grow in Ovules and become Seeds.
  • When germinated, these Seeds started growing as (new Plants).

Image of the Plant Reproduction:

Test: Sexual Reproduction in Flowering Plants - 2 - Question 24

In which of the following plants fruit contain larger number of seed?

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 24

The number of ovule present in ovary determine the number of seeds produced inside the fruit. Mango and neem produce single seed in each fruit. Lemon contain a number of seeds but orchid contain many small size seeds.

Test: Sexual Reproduction in Flowering Plants - 2 - Question 25

Dormancy is the____.

Detailed Solution for Test: Sexual Reproduction in Flowering Plants - 2 - Question 25

Dormancy is the state of state of inactivity during which metabolic process slows down. Seed may remain viable to several months to years depending upon type of seeds and condition.

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