1.

Write in detail, the structure of pollen grain

Answer»
  • Pollen grains in angiosperms are unicellular, uninucleate, haploid, non-motile normally round structure. 
  • The nucleus and dense cytoplasm are covered by a two-layered wall. 
  • The outer layer is thick, stiff and protective and is called exine. 
  • The inner layer is thin and elastic and is made up of cellulose and pectin.
  • There are a few thin areas in the exine called germ pores.


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