Question
Biology Question on sexual reproduction in flowering plants
In angiosperms, the fusion of male gamete with the secondary nucleus is considered as "Second fertilization" because
A
It is fusion of two nuclei
B
Secondary nucleus is a sister nucleus of the egg
C
It takes place in embryo sac
D
It takes place after pollination
Answer
Secondary nucleus is a sister nucleus of the egg
Explanation
Solution
When the second male gamete fuses with the diploid secondary nucleus to form the triploid primary endosperm nucleus (PEN). This is called triple fusion. Since each of the polar nuclei is sister nucleus of the egg and it is called second fertilisation