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What are the layers of pollen and write its composition?
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The pollen grains are covered with two concentric wall layers, the outer exine and the inner intine. The stratification of pollen wall is primarily based upon optical microscopy of whole as well as sectioned grains and upon staining reactions of the strata. Recently such stratification is complemented by the biochemical analysis of the various pollen wall layers.
The intine is pectocellulosic in nature and acid degradable, while the exine is composed of sporopollenin which is found to be resistant to both physical and chemical decay.
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