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which of the following is the tue for the arrangement of the nuclei in a polygonum type of embryo sac in the angiospermic plant 2+4+2 2+3+3 3+2+ 3 3 +3 +2

which of the following is the tue for the arrangement of the nuclei in a polygonum type of embryo sac in the angiospermic plant
  1. 2+4+2
  2. 2+3+3
  3. 3+2+ 3
  4. 3 +3 +2

Grade:12

2 Answers

Gaurav
askIITians Faculty 164 Points
8 years ago
Hello Student
Correct answer is 3. 3+2+2
In angiosperms the polygonum type of embryo sac is the most common. In this embryo sac the arrangement of the nuclei is 3+2+3 that is 3 in antipodal cells 2 as polar nuclei and3 in egg apparatus(two in synergids ans one in egg cell)
Raheema Javed
156 Points
8 years ago
The correct answer is (3) 3+2+3.
Nucleus of functional megaspore divides by three mitotic divisions to form 8 nuclei, out of which
(i) Three of them get organised as cells at micropylar end forming egg apparatus. One is egg cell (n) and two are synergids (n) or co-operative cells.

(ii) Two nuclei (one from each pole) in the centre are called polar nuclei (n)

(iii) Three cells at chalazal end form antipodals (n) or vegetative cells of female gametophyte

258-2297_female_Gametophyte_development.gif

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