Gametes then unite in fertilization and form a diploid zygote.
Collectively, the sperm and the ova are also referred to as gametes .
Sperm and ova unite to form a diploid zygote.
what unites to form a diploid zygote?

a. plant reproduction
b. Most plants
c. orchids
d. sperm and ova
e. salt and pepper
f. predator and prey
g. honeybees
h. diploids and zygotes