Question 1

What is the function of the germ pore in a pollen grain?

Accepted Answer

The germ pore is the aperture on the pollen grain exine where sporopollenin is absent. Its primary function is the emergence of the pollen tube during germination.

Question 2

Which of the following is resistant to biological and chemical degradation?

Accepted Answer

Sporopollenin is one of the most resistant organic materials known. It can withstand high temperatures, strong acids, and alkali, and no enzyme that degrades it is known.

Question 3

Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called:

Accepted Answer

Geitonogamy is the transfer of pollen grains from the anther to the stigma of another flower of the same plant. Though it is cross-pollination functionally, genetically it is similar to autogamy.

Question 4

In angiosperms, microsprogenesis involves:

Accepted Answer

Microsporogenesis is the formation of microspores from a pollen mother cell (PMC) through meiotic division.

Question 5

The nutritive tissue in angiosperm seeds that is triploid is:

Accepted Answer

The endosperm in angiosperms is typically triploid (3n) as it is formed by the fusion of three haploid nuclei (triple fusion).

Sexual Reproduction in Flowering Plants — NCERT Class 12 Biology Important Questions & Revision Notes