Class 12 notes on Structure of Pollen Grains and function
Pollen Grains What is Pollen Grain - A very minute spherical structure present on the flower representing male gametophyte is known as Pollen Grains . Pollen Grains are the medium for fertilization i.e., the tiny body is swirling in the air and attach to the female part and promote pollination. Pollen Grains are approximately 25-50 micrometers in diameter. Structure - Pollen has the outstanding feature of two-layered walls made in such a way that it shows a variety of patterns and at the same time also represents consistency in organization and chemistry. The outer layer is known as Exine , divided into two subparts, exine sexine, and exine nexin while The inner layer is thin and made up of cellulose and pectin known as Intine. Some chemicals are present on the...