Question
Why do you think the exine should be hard? What is the function of germ pore?
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Answer
Exine is the outermost layer of pollen grain which is made up of a highly resistant organic material called sporopollenin. Exine should be hard to withstand high temperature, strong acids and alkali. Germ pores are prominent apertures where sporopollenin is absent which later on protrudes out as pollen tube.
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