During an excavation of soil,pollen fossils w | vedclass

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(D) The exine of pollen grains is highly resistant to enzyme action.Pollen grains possess a prominent two-layered wall. The hard outer layer,known as

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the exine of pollen grains is highly resistant to enzyme action

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(D) The exine of pollen grains is highly resistant to enzyme action.Pollen grains possess a prominent two-layered wall. The hard outer layer,known as the exine,is composed of sporopollenin,which is one of the most resistant organic materials known to science.It can withstand high temperatures,strong acids,and strong alkalis.To date,no enzyme has been discovered that can degrade sporopollenin. This unique chemical property allows pollen grains to be well-preserved as fossils over long periods.

During an excavation of soil,pollen fossils were retrieved from the deepest layer of soil. The pollen grains remained as fossils because

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