Question

mention any two contrivance in flower which favour cross-pollination?

Answer 1

Sperms enter the female reproductive tract through sexual intercourse. Tail of the sperms help them to move inside the female reproductive tract in order to reach the egg and fertilize it.

Answer 2

These are the two contrivances in flowering plant for cross pollination:

- Sexuality:  flowers are unisexual; they can be monoecious or dioecious.

Monoecious plants favors cross as well as self pollination whereas dioecious plants only favor cross pollination.

- Self sterility: This helps flowers to avoid from self pollination. Moreover, Pollen grains from the same flower has no effect on its stigma.