Sexual Reproduction in Flowers (11-4-23)

In angiosperms pollination occurs when pollen grains are in –

• (a) 2-celled stage

• (b) 3-celled stage

• (c) 2 or 3 celled stage

• (d) Uninucleate stage

Pollen grains of different species show characteristic difference in –

• (a) Shapes, size and colours only

• (b) Shapes, sizes, colours and ploidy only

• (c) Shapes, sizes, colour and design only

• (d) Ploidy only

The viability of pollen grains depends upon –

• (a) Prevailing temperature

• (b) Prevailing humidity

• (c) Genetic potentiality of the concerned species

• (d) All

Which of the following has the least pollen viability?

• (a) Cereals like wheat and rice

• (b) Members of Rosaceae

• (c) Members of Leguminoseae

• (d) Members of Solanaceae

• 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

In typical embryo sac, the nuclei are arranged as –

• (a) 3 + 2 + 3

• (b) 3 + 3 + 2

• (c) 2 + 3 + 3

• (d) 2 + 4 + 2

The female gametophyte / embryo sac of typical dicot (Polygonum) or monosporic embryo sac is –

• (a) 7-celled and 7-nucleate

• (b) 8-celled and 8-nucleate

• (c) 7-celled and 8-nucleate

• (d) 8-celled and 7-nucleate

Embryo sac is monosporic when it develops from –

• (a) One of the four megaspores of a megaspore mother cell (MMC)

• (b) 3 megaspores of a megaspore tetrad

• (c) 2 megaspores

• (d) The MMC where meiosis has occured but cytokinesis does not take place

Egg apparatus of an embryo sac consists of –

• (a) Egg cell only

• (b) Egg cell + 3 antipodal cells

• (c) One oosphere (egg) + 2 synergids

• (d) One oosphere (egg) + 2 synergids + 2 antipodal cells

he largest cell in an embryo sac is –

• (a) Egg

• (b) Central cell

• (c) Synergid

• (d) Antipodal cell