Question

The site of formation of pollen grains is in the
A. Pistil
B. Receptacle
C. Petal
D. Stamen

Answer 1

Hint: Pollen grains are the male gametophyte developed on the male organ of the flower of a plant. They are generally spherical in shape about 25-50 micrometers in diameter and have a prominent two layered wall.

Complete step by step answer:
-A typical angiosperm flower has four whorls. Two of which are essential and two non-essential whorls.
-All these four whorls are arranged on a disc-like structure called receptacle.
-The non-essential whorls are the outer whorls for the protection of the essential whorls.
-The non-essential whorls of a flower are calyx and corolla.
-The calyx is made of sepals and corolla is made of petals.
-The essential whorls are the male and female organs of the plant, which are androecium and gynoecium respectively.
-Gynoecium is made of pistil and the androecium consists of stamens.
-Pollen grains containing the male gametes are developed inside the anther of the stamens.
-The egg, which is the female gamete is developed inside the ovary of the pistil.

Hence the correct option is ‘D’.

Note:
Remember male gametes are developed from the pollen grains, which is in turn developed inside the sporogenous sac inside the anther of a stamen which makes up the male reproductive organ in the flower which is the androecium. The female gamete, egg, is developed inside an embryo sac inside the ovule of the ovary which is a part of the pistil which make up the female reproductive organ of a flower, gynoecium.