- Home
- Standard 12
- Biology
2.Human Reproduction
normal
Why do all copulations not lead to fertilisation and pregnancy? The root cause is _________.
A
Due to numerous sperms and one ovum
B
Due to less progesterone
C
Ovum and sperms are not transported simultaneously to the ampullary-isthmic junction
D
Due to non-formation of corpus luteum
Solution
Life span of sperm in male reproductive tract $\rightarrow$ few weeks
Life span of sperm in female reproductive tract $\rightarrow \;48$ to $72 \;hours$.
Viability of secondary oocyte after its release is for $24 \;hours$.
So, both must be viable for fertilization to occur.
Standard 12
Biology
