Practice question
Question
Sporopollenin is one of the most resistant organic materials known. It is absent in which specific region of the pollen grain?
Explanation
Sporopollenin forms the hard outer layer called the exine. However, it is absent at specific apertures called germ pores to allow the pollen tube to emerge during germination. The intine is made of cellulose and pectin, not sporopollenin.
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