Question
Biology Question on Pre-Fertilisation: Structures And Events
In a flowering plant, megaspore develops into an embryo sac, which contains:
A
4 cell, one of which is an egg
B
6 cells, one of which is an egg
C
8 cells, one of which is an egg
D
none of these
Answer
none of these
Explanation
Solution
An ideal embryo sac contains 7 cells and 8 nuclei. 3 cells are present at the micropylar end and form egg apparatus, mid of which forms egg cell and rest two lateral form synergids. One cell present in the centre of embryo sac which is known as secondary nuclei and contains two nuclei and rest three cells are present at chalazal end form antipodal cells,