Observe the given diagram of male reproductive system and answer the following questions:
The given diagram represents the female gametophyte of angiosperms. Answer the following:
(i) Name the parts - A, B, C.
(ii) Function of filiform apparatus.
(iii) Part that forms PEN.
(iv) Ploidy of antipodals. 
What would happen if a large volume of untreated sewage is discharged into a river?
The given diagram represents the female gametophyte of angiosperms. Answer the following:
(i) Name the parts - A, B, C.
(ii) Function of filiform apparatus.
(iii) Part that forms PEN.
(iv) Ploidy of antipodals. 
Draw a neat and well-labelled diagram of a transverse section of a young anther. 