Question
Biology Question on Pre-Fertilisation: Structures And Events
Starting from the innermost part, the correct sequence of parts in an ovule are
A
egg, nucellus, embryo sac, integument
B
egg, embryo sac, nucellus, integument
C
embryo sac, nucellus, integument, egg
D
egg, integument, embryo sac, nucellus
Answer
egg, embryo sac, nucellus, integument
Explanation
Solution
Egg cell is inside the embryo sac in the ovule. The embryo sac is further enclosed by the parenchymatous tissue, nucellus, which provides nutrition to developing embryo. Nucellus is ultimately surrounded by integuments.