Question

Special cellular thickenings are observed at the micropylar end of the synergids. Identify the option which correctly identifies these structures and their function.

• A. filiform apparatus - helps in the guidance of the pollen tube into the synergid
• B. egg apparatus - forms the mature, 8-nucleate and 7-celled, angiospermic embryo sac
• C. antipodal cells - provision of nourishment to the egg apparatus
• D. central cell - characterizes the female gametophyte and allows the initiation of double fertilization as required

Answer 1

Answer: (A)

Three cells are grouped together at the micropylar end and constitute the egg apparatus. The egg apparatus, in turn, consists of two synergids and one egg cell. The synergids have special cellular thickenings at the micropylar tip called filiform apparatus, which play an important role in guiding the pollen tubes into the synergid.