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Name the organic materials the exine and...

Name the organic materials the exine and latine of an angiosperm pollen grains are made up of. Explain the role of exine.

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The exine layer is made up of sporollenin, which is one of the msot resistant substances found in nature.
the intine layer is made up of cellulose and pectin materials.
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(a) Name the organic material exine of the pollen grain is made up of. How is this material advantageous to pollen grain ? (b) Still it is observed that it does not form a continuous layer around the pollen grain. Give reason. (c) How are 'pollen banks' useful ?