Question

why only one sperm fertilises the ova

Answer 1

If more than one sperm fuses—a condition called polyspermy—multipolar or extra mitotic spindles are formed, resulting in faulty segregation of chromosomes during cell division; nondiploid cells are produced, and development usually stops. Two mechanisms can operate to ensure that only one sperm fertilizes the egg.

hope this helps
thanks
@Ankitaa0223

Answer 2

Heya

only sperm are highly active and mobile (moving) so only one sperm fuses with ovum (or egg) in oviduct to form a zygote .

hope it help you

@rajukumar☺