Identify the structures A, P,Q and R.
'A' is a structure that is typically 7 celled and 8 nucleate. Within ‘A’ three cells are grouped together at the micropylar end and constitute 'P', ‘A’ also contains three cells towards the chalazal end called 'Q' and largest cell of ‘A’ which is termed as ‘R’ has two polar nuclei.

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A- Megasporangium, P- Egg apparatus, Q- Antipodals, R-Central cell

A- Embryo sac, P- Synergids, Q- Antipodals, R-Central cell

A- Embryo sac, P- Antipodals , Q- Egg apparatus, R-Central cell

A- Embryo sac, P- Egg apparatus, Q- Antipodals, R-Central cell

answer is D.

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Detailed Solution

Embryo sac is a structure that is typically 7 celled and 8 nucleate. Within Embryo sac three cells are grouped together at the micropylar end and constitute Egg apparatus, Embryo sac also contains three cells towards the chalazal end called Antipodals and largest cell of Embryo sac which is termed as Central cell has two polar nuclei.

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