Biology · SEXUAL REPRODUCTION IN FLOWERING PLANTS

Refer to the given stages of megaspore and embryo sac development shown below. What is the correct sequence of structures depicted in (a)?

1. A
   Megaspore mother cell -> Megaspore dyad -> Megaspore tetrad
2. B
   Megaspore tetrad -> Megaspore dyad -> Functional megaspore
3. C
   Megaspore mother cell -> 2-nucleate stage -> 4-nucleate stage
4. D
   Megaspore dyad -> Megaspore tetrad -> Mature embryo sac