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.

• A

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

• B

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

• C

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

• D

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