Sexual Reproduction in Flowering Plants MCQs for NEET — Botany Questions with Answers

The embryo sac present in the nucellus is also called as female gametophyte.

Xenogamy is the cross pollination between two flowers of different plants.

Geitonogamy is the cross pollination between two flowers of the same plant.

Cleistogamy is the phenomenon in which group of plants, set seeds without exposing their sex organs. It is the most efficient floral adaptation for promoting self-pollination and it may be inherent or ecological.

Dichogamy refers to the maturation of male and female sex organs at differetn times. It is a safeguard against self-pollination.

Perisperm is the nutritive tissue outside the sac containing the embryo in some seeds.

  Two parts of a typical stamen are – the long and slender stalk called the filament, and the terminal generally bilobed structure called the anther. The proximal end of the filament is attached to the thalamus or the petal of the flower.

  Each anther is bilobed and each lobe is dithecous i.e. four theca are present in a typical angiosperm anther.                                                                                          

The anther is a four-sided (tetragonal) structure consisting of four microsporangia located at the corners, two in each lobe.

Being apocarpous is a feature of pistil and not anther. When there are more than one pistil, they may be fused together (syncarpous) or may be free (apocarpous).

Nucellus is present in female reproductive part of plant- ovule.

(4) In a transverse section, a typical microsporangium appears near circular in outline.

The innermost wall layer is the tapetum. It nourishes the developing pollen grains. Cells of the tapetum possess dense cytoplasm and generally have more than one nucleus.