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CBSE 12th Standard Biology Subject Sexual Reproduction in Flowering Plants Ncert Exemplar 3 Marks Questions 2021

Published on: 24/05/2021

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Std: 12th Standard CBSE - Biology

chapter: - NCERT Exemplers

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Questions:

Generic 3

4 x 3 = 12

Starting with the zygote, draw the diagrams of the different stages of embryo development in a dicot.

In the diagram given below, identify the parts of the flower and mention the post-fertilisation changes shown in the parts

Do you think microspores and pollen grains are the same structures. If they are different then what is the basic difference between them?

A _______ is the development of seeds from unfertilised female gamete.
B. Parthenocarpy is the development of______in an unfertilised flower, resulting in a_______
C. Polyembryony is the presence of more than one_______ in the_______
D. There are usually three germ pores in _______and one in _______
E. The anther wall is composed of_______to_______layers.
F. The flowers producing _______ and _______ with bright _______ attract the insects.
G. Plants with reduced power of _______ reproduction, _______ dormant period of seed or _______ viability are propagated through vegetative reproduction.
H. The integuments of ovule surround the_______all around expect at the apex, leaving a narrow passage, called the _______.
I. The wind-pollinated flowers are generally _______sexual.
J. In many dicots, the reserves in the _______ and consumed by the developing embryo.

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Answers Key:

Generic 3

4 x 3 = 12

Parts	Post-fertilisation change
A-Stigma B-Style	Both degenerate
C-Ovary	Fruit
D-Ovule	Seed
E-Integuments	Seed coat

Microspores and pollen grains are not the same structures. Initially, the diploid microspore mother cell divides by meiosis to form four haploid microspores which are arranged in tetrads. Each microspore has single haploid nucleus. Then the nucleus of microspores divides mitotically so that the two haploid nuclei are formed inside the spore. The entire cell becomes bicellular by developing a separating wall. Now the spore is two-celled ----- one large tube cell and other smaller generative cell. This structure is regarded as young male gametophyte and called as pollen grain. Pollination takes Place at this two-celled stage.

A. Parthengenesis
B. fruit, seedless
C. embryo, seed
D. dicots, monocots
E. 4 to 5
F. nectar fragrance, colours
G. sexual, long, poor
H. nucellus, micropyle
I. uni
J. endosperm.