Question

Part of the gynoecium which receives the pollen is called as
(a) Ovary
(b) Ovule
(c) Style
(d) Stigma

Answer 1

Hint: The gynoecium is the female reproductive part of the flower. It constitutes one or more carpels. A carpel is also known as a pistil. Each pistil is divided into three parts:- Stigma, Style, and Ovary.

Complete answer:
The male reproductive part of a plant, Stamen has two parts:- A bilobed anther and a long slender filament. A mature anther contains pollen grains that are released with the dehiscence of the anther.
The pollen now lands on the pistil which is the female reproductive part of the plant. It has the following parts:-
-Stigma is usually the tip of style and is the receiving surface for pollen grains. It provides a landing platform for the pollen grains.
-The elongated slender part beneath the stigma is called the style. It connects the ovary to stigma.
-The enlarged basal part of the pistil is called an ovary. Inside this ovary is the ovarian cavity (also called a locule). The placenta is located inside this ovarian cavity.
-The ovule is a small structure attached to the placenta through a stalk called a funicle. At the hilum, the body of the ovule fuses with the funicle. Thus, the hilum represents the junction between the ovule and the funicle.

Additional information:
When a compatible pollen grain falls on the stigma, it germinates on it and produces a pollen tube through one of the germ pores. The contents of pollen grain move into this pollen tube. The pollen tube grows through the tissues of stigma and style and reaches the ovary. A pollen tube enters the ovule after reaching the ovary and enters one of the synergids through the filiform apparatus. This is called pollen-pistil interaction.

So, the correct answer is ‘Stigma’.

Note: Stigma is the first part of the carpel to receive the pollen. Although the other parts also receive the pollen subsequently, Stigma is the tip of the carpel on which the pollen lands.