Q.

In a 7-celled and 8-nucleate embryo sac

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a

the polar nuclei are situated above the egg apparatus in central cell

b

egg apparatus has two synergids and one egg cell at micropylar end

c

filiform apparatus in synergid direct the pollen tube to enter the ovule

d

antipodal cells are haploid but have different genetic composition to that of egg cell

answer is B.

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Detailed Solution

In the embryo sac of angiosperms, egg apparatus is present at the micropylar end and has one egg cell flanked by two synergids. The central cell is present in between the egg apparatus and antipodals present at the chalazal end and has two haploid polar nuclei present nearer to egg apparatus. It is 7-celled and 8-nucleated structure.
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