|1 Crore+ students have signed up on EduRev. Have you?|
In some plants anther and stigma mature at same time this condition is called?
Which of the following plant contain unisexual flower?
The flower which contains either male or female reproductive part is called a unisexual flower.
Papaya plant produces either male or female flower in separate plants.
During Hybridisation process anther of bisexual flower is removed before it dehisces is called?
Hybridisation is the process to develop hybrid plants with desired traits. In bisexual flower, the stamen is removed with the help of forceps to avoid self-pollination. This method is called emasculation.
Which of the following occupies central position in flower?
Bisexual flower have four main parts. Pistil or carpel is located at center followed by stamen, carpel and sepals. Pistil contains stigma, style and ovary.
Insect pollinated flowers are _________.
The flower in which pollen grain is transferred from anther to stigma of anther flower by insects are colorful to attract insects and contain nectar.
What is the function of germ pore?
A typical angiosperm embryo sac at maturity is _________.
Angiospermic embryo sac is 8-nucleate but 7-celled at maturity. This includes 3- celled egg Synergids, 3 antipodal cells and 2 polar nuclei.
Inside the ovary, the ovule is attached to the placenta by means of:
Ovule/s are located inside the ovary. The point of attachment of the ovule to the ovary is called the funicle. Funicle extends to hilum as stalk.
The female gametophyte in angiosperm is:
The female gametophyte in angiosperms is called Embryo sac. It contains egg apparatus, antipodal cells and polar nuclei. After fertilisation embryo sac changes into seed.
In ovule, archesporial cell differentiates from nucellus:
In ovule female gamete is formed at micropylar end and three antipodal cells at chalazal end. The two central nuclei are called polar bodies that fuse with one of male gamete to form endosperm.
Maize flower is pollinated by winds. The transfer of pollen grain from anther to stigma by wind is known as anemophilus.
Which of the following plant is not pollinated by water?
Lotus is an aquatic plant but the flower of lotus is outside and above the water surface. So, it cannot be pollinated by water. It is generally pollinated by insects.
Entomophilous flower are pollinated by:
The transfer of pollen grain from anther to stigma is called pollination. Pollination is caused by winds, insects, water, and some other means. Insect pollinated flowers are called Entomophilous flowers.
In most of the angiosperms, pollen grains are shed at _________.
About 60% of angiosperms, pollen grains are shed at two celled stage. The larger cell is called vegetative cell and the smaller one is called generative cell. Each generative cell produces two male gametes.
The anther is a four sided structure consisting of four _________ located at the corner.
Anther is bilobed structure at the tips of stamen. Each lobe consists of two theca. Each theca change into microsporangium. Anther forms four sided structure having four microsporangia in which pollen grains are formed.
In which of the following plants endosperm is completely used up by developing embryo?
Endosperm is present around the growing embryo. It provides nutrition to the growing embryo. In leguminous plants, it is completely consumed by the embryo and nothing remains in seed as in pea.
Endosperm type in which first division of primary endosperm nucleus and few subsequent division are not accompanied by wall formation is called?
PEN (primary endosperm nucleus) divides into two nuclei and subsequent division of nucleus produce large number of nucleus without cell wall formation. These types of endosperm are called free nuclear type of endosperm.
Number of nuclei participating in double fertilisation is?
Double fertilisation involves fusion of one male gamete with egg during Syngamy and fusion of two polar nuclei with other male gametes. So, total 5 nuclei are involved in double fertilisation.
The cotyledon of maize grain is technically called as?
Maize grain is monocotyledonous, having a single cotyledon. This cotyledon is also called scutellum.
The portion of embryonic axis of monocots above the level of attachment of scutellum is called as?
The part of axis above the level of attachment of scutellum is called epicotyl. It has as shoot apex and few leaf primordia enclosed in a hollow foliar structure called coleoptile. Epiblast represents rudiments of second cotyledon.
The fruits which develops without fertilization are called as?
The seedless fruit develops without fertilisation by using some plant hormones. The fruit so formed are called parthenocarpic.
Placenta is located inside the _________.
Placenta is located inside the ovarian cavity. It help in transport of nutrient to megasporangium or ovule. Ovule is attached to placenta by means of stalk called funicle.
Coconut fruit is dispersed by _________.
Seeds dispersed by water are contained in light and buoyant fruit, giving them the ability to float. Coconuts are well known for their ability to float on water to reach the land where they can germinate. The coconut seed is especially well adapted to increase its range by the method of ocean dispersal. The seed floats when its outer layers dry out. The buoyant coconuts drift on ocean currents and end up on tropical beaches where they germinate and take root.
Which of the following is an example of false fruit?
Study of fruits and their cultivation is known as_________.
The study of fruits and their cultivation is known as pomology. This is one of the fasted growing fields of horticulture combined with genetically modified fruits.