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Identify A, B, C and D structures shown in above diagram of female gametophyte:

 

A

B

C

D

(a)

Synergid

Polar nuclei

Central cell

Antipodal cells

(b)

Antipodal cells

Polar nuclei

Central cell

Synergids

(c)

Antipodal cells

Polar nuclei

Megaspore mother cell

Synergids

(d)

Filiform apparatus

Polar nuclei

Central cell

Antipodal cell