Question: 109: In general the egg apparatus of embryo sac in angiosperm consists of :
(1) One egg cell, two synergids, three antipodal cells, two Polar nuclei
(2) One egg cell, two synergids, two antipodal cells, three Polar nuclei
(3) One egg cell, three synergids, two antipodal cells, two Polar nuclei
(4) One egg cell, two synergids, two antipodal cells, two Polar nuclei
Answer: Option (1)
Explanation:
In a typical angiosperm, the embryo sac is a seven-celled and eight-nucleate structure.
The egg apparatus is located at the micropylar end of the embryo sac.
It normally includes one egg cell and two synergids.
In addition to the egg apparatus, the complete embryo sac also contains three antipodal cells at the chalazal end and two polar nuclei in the central cell.
Thus, the general structural organisation associated with the embryo sac includes one egg cell, two synergids, three antipodal cells, and two polar nuclei.
Among the given options, Option (1) correctly represents this complete arrangement.