write a short note on structure of pollen grain
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Answer:
→The male gametophytes are called as the pollen grains.
→ Pollen grains are spherical in structure and are 25 - 50 micrometres in diameter.
→ They consist of two layers, the outer wall exine and the inner wall intine.
→ Exine is hard and is made up of sporopollenin which is one of the hardest and most resistant organic material.
→ The sites where sporopollenin is absent is called as the germ pores.
→ Intine is made up of cellulose and pectin.
→ A mature pollen grain contains two cells: vegetative cell and generative cell.
→ The vegetative cell is comparitively bigger, has an irregularly shaped nucleus and acts as a food reserve.
→ The generative cell is small and spindle shaped with dense cytoplasm.
→ Pollen grains are rich in nutrients and are used as food supplements in western countries.