Question

Identify A to F in the diagram:-

• A. A–Egg, B–Filiform apparatus, C–Synergid, D–Antipodal cells, E–Polar nuclei, F–Central cell
• B. A–Egg, B–Synergid, C–Filiform apparatus, D–Antipodal cells, E–Central cell, F–Polar nuclei
• C. A–Central cell, B–Egg, C–Synergid, D–Antipodal cells, E–Filiform apparatus, F–Polar nuclei
• D. A–Filiform apparatus, B–Synergid, C–Egg, D–Central cell, E–Polar nuclei, F–Antipodal cells

Answer 1

Answer: (D)

The embryo sac or the female gametophyte has three cells that 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. Three cells are at the chalazal end and are called antipodals. The large central cell, as mentioned earlier, has two polar nuclei. Thus, a typical angiosperm embryo sac, at maturity, though 8-nucleate is 7-celled.