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  • The arrangement of the nuclei in a normal embryo sac in the dicot plants isOption: 1 3 + 2 + 3Option: 2

The arrangement of the nuclei in a normal embryo sac in the dicot plants is

Option: 1

3 + 2 + 3


Option: 2

2 + 3 + 3


Option: 3

3 + 3 + 2


Option: 4

2 + 4 + 2


Answers (1)

best_answer

As we have learnt:

-Female Gametophyte or Embryo sac:

  • After the 8-nucleate stage, cell walls are laid down leading to the organisation of the typical female gametophyte or embryo sac.
  • Three cells are grouped together at the micropylar end and constitute the egg apparatus. 
  • The egg apparatus, in turn, consists of two synergids and one egg cell.
  • The synergids have special cellular thickenings at the micropylar tip called filiform apparatus, which play an important role in guiding the pollen tubes into the synergid.
  • Three cells are at the chalazal end and are called the antipodals. 
  • The large central cell has two polar nuclei.
  • Thus, a typical angiosperm embryo sac, at maturity, though 8-nucleate is 7-celled.

Hence, the correct answer is option a.

Posted by

Deependra Verma

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