Given figure of Hydra shows its reproductive structures and manner of fertilisation.
Observe and answer that why is it not showing self fertilisation ?

Options

A. Distance between testis and ovary is more.
B. Sperms do not swim downwards.
C. Ovary matures earlier than testis.
D. Testis matures earlier than ovary.

Answer

d

Explanation

Cross fertilisation occurs in Hydra. The testic matures earlier than ovary. The spermotozoa released from the testic of one Hydra swim I water with their tails and finally come into contact with the ovum of another Hydra. Ovum lives only for a short time after it is exposed. During this period fertilisatiion must take place. Thus given figure is not showing self-fertilisation but cross fertilisation.