Question:

Pollen grains are able to withstand extremes of temperature and dessication because their exine is composed of

Updated On: Jul 28, 2022
  • cutin
  • suberin
  • sporopollenin
  • callose
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The Correct Option is C

Solution and Explanation

Exine is outer layer of pollen grain which is acetolysis resistant layer. It is also resistant to physical and biological degradation. Because of this property of exine, pollen grains are found well preserved for long periods in fossil deposits.
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Concepts Used:

Pollination and Double Fertilization

Pollination is defined as the pre-fertilization event or process, where pollen grains from another are transferred to the stigma of a flower.

Double fertilization is a complex process that involves the fusion of one female gametophyte with two male gametes.

Types of Pollination:

All plants having flowers completely rely on the pollination method for reproduction. There are 2 types of pollination –

  • Self Pollination
  • Cross-Pollination

The end products of double fertilization are:

  • Diploid Zygote
  • Primary Endosperm Nucleus