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Write a short on pollen grain

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Write a short on pollen grain
  • 1 answers

Yogita Ingle 6 years, 7 months ago

Each pollen grain is a tiny spherical structure, surrounded by 2 layers:

Exine

  • Hard, outer layer
  • Composed of sporopollenin
  • Highly resistant

Intine

  • Thin inner layer
  • Composed of cellulose & pectin

 Formation of a pollen grain from microspore involves the following changes:

  • Expansion of the microspore
  • Formation of a large vacuole
  • Microspore nucleus displaced to an eccentric position against microspore wall
  • Nucleus undergoes first pollen mitosis
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