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  • In angiosperms, the male gametophyte is ___ and female gametophyte is ___Option: 1 Pollen grain and endosperm<s

In angiosperms, the male gametophyte is ___ and female gametophyte is ___

Option: 1

Pollen grain and endosperm


Option: 2

Anther and ovary


Option: 3

Pollen grain and embryo sac


Option: 4

Pollen grain and ovule


Answers (1)

best_answer

 

 


Reproduction in angiosperms:
 

  • The flowers possess stamens or androecium as male sex organ and gynoecium or carpels as female sex organs.
  • Anther of the stamen has microsporangia in which microspores or pollen grains are formed from microspore mother cells upon reduction division. 
  • The microspores are carried to the stigma by various agents during pollination. 
  • The male gametophyte is three-celled.
  • Gynoecium or pistil has carpels which have ovules in the ovary. 
  • Ovules are of various types. The most common one is anatropous ovule. 
  • Anatropous ovule has only one megaspore mother cell which undergoes reduction division and forms four haploid megaspores. 
  • One megaspore develops into the female gametophyte or embryo sac within the ovule which has 8-nuclei and 7-cells. It has an egg apparatus with three cells out of which one is egg cell and the two others are synergids. The central cell has two polar nuclei. At the posterior side, there are three antipodals.
  • The pollen tube enters the ovule and eventually into its embryo sac through synergid and discharges its two male gametes.
  • One of the male gametes fuses with the egg cell and forms the zygote and the second one fuses with the two polar nuclei and forms the triploid Primary Endosperm Nucleus. It is called double fertilization which is unique to angiosperms. 
  • Fertilisation is siphonogamous i.e. occurs with the help of pollen tube and oogamous. 
     

 

 

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In angiosperms, the male gametophyte is pollen grain and female gametophyte is embryo sac.

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Riya

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