Sexual reproduction in flowering (15-04-2023) Ichhapur

The first division in a pollen grain results in formation of –

• (a) a larger vegetative cell and smaller generative cell

• (b) a larger generative cell and smaller vegetative cell

• (c) 2 equal cells

• (d) 4 male gametes

he inner wall of pollen grain –

• (a) Is thin, continuous and pecto cellulosic and is called intine

• (b) Comes out in the form of pollen tube through germpore

• (c) Is thick and consists of sporopollenin

• (d) a and b

Which of the following points is incorrect about sporopollenin?

• (a) It is one of the most resistant organic material known

• (b) It can withstand high temperature and strong acids and alkali

• (c) 2 enzymes that degrade sporopollenin are known so far

• (d) Pollen grains are well preserved as fossils because of presence of sporopollenin

Micropyle is found in –

• (a) Seed

• (b) Ovule

• (c) Both ovule and seed

• (d) Fruit

Which of the following sequences of development of embryo sac / female gametophyte is correct?

• (a) Nucellus --> Megaspore-> Embryo sac

• (b) Nucellus --> Megaspore mother cell--> Megaspore--> embryo sac

• (c) Nucellus--> Megasporangium--> Megaspore--> Embryo sac

• (d) Nucellus--> Megagametophyte--> Megaspore --> Embryo sac

• (a) A - I, B - II, C - III, D - IV, E - V

• (b) A - V, B - IV, C - III, D - II, E - I

• (c) A - IV, B - II, C - I, D - III, E - V

• (d) A - I, B - III, C - V, D - II, E - IV

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An ovule has generally how many embryo sac?

• (a) 1

• (b) 3

• (c) 4

• (d) 8

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Autogamy is –

• (a) Transfer of pollen grains from anther to stigma of the same flower

• (b) transfer of pollen grains from anther to stigma of another flower

• (c) Pollination between two flower

• (d) Maturation of anther and stigma at different times