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Hibiscus pollen
What is pollen?
The pollen grain is the structure used to transport the male gamete (i.e. male DNA) to the female part of a flower. Pollen must be strong to protect the male gametes on their journey. The outer wall of the pollen grain, called the exine, is composed of a very unusual substance called sporopollenin which is very tough. The inner layer is made of cellulose and is similar in construction to an ordinary plant cell wall. Pollen grains are microscopic - usually about 15 to 100 microns - and just a pinch of pollen powder contains thousands and thousands of grains.
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General Structure of Pollen: |
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Ornemantation of Pollen Grains:
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Layers of Pollen:
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