in Sexual reproduction in flowering plants by

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Misc pollenThe pollen grains consists two layers; the outer exine and the inner intine. The intine is a uniform thin layer made up of pectolase which is destroyed during the acetolysis. The exine is divided into two layers the outer sculptured sexine and the inner non-sculptured layer known as the nexine. The exine which is capable of resistant to physical and biological degradation and acetolysis. This helps the pollen grains to be preserved for long periods of time in fossil deposites.