Question

Pollen grains are present in
A. Sepals
B. Stigma
C. Anther
D. Ovary

Answer 1

Pollen grains represent the male gametes in the reproductive system of a flower. These are also referred to as male microgametophytes in seed plants.

Complete answer:
-Pollen grains represent the male reproductive gametes of flowers. They are found in the anthers of flowers. Pollen grain is a tiny body that varies in their shape and structure. They are borne in the male structures present in plants bearing seeds. These are transported to the female parts of the plant via pollination which may take place via insects, water, wind, etc. and thereafter fertilization takes place.
Anthers present in the stamens of flower are responsible for production of pollens in the angiosperms. These pollen grains may range from fine to coarse powder. In several gymnosperms or the conifers, pollen grains are produced inside the microsporangium present in the male cone while in angiosperm flowers, they are formed in the anthers.
-Microspore mother cells are present beside the inner edge region of anther sacs which is sometimes also called microsporangia. Exine is the outer portion of the pollen consisting of sporopollenin, which is a complex polysaccharide. Microspore mother cell undergoes meiosis for production of the pollen grains.
-On the other hand, the green petal-like structure present at the basal portion of the flower is called the sepal which helps in providing protection to the developing bud while stigma and ovary are parts of the pistil. At the pistil top, a sticky surface, known as stigma is present which helps in trapping and holding the pollen grains. Stigma remains held onto the style which is a tube like structure. This style reaches down towards the ovary containing the ovules.

Hence, the correct answer is option (C).

Note: Pollen grains are transferred from the anthers present on one flower to the stigma present on other flowers but on the same plant. This process is known as Geitonogamy.