Q: You are presented with the quiz "What is formed when a male gamete and an egg fuse together?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "fertilization occurs when a sperm and an egg fuse to form a diploid zygote" and "male gametes are called sperm". So, what's the best answer to the question?

Possible answers:
(a). Plant reproduction
(b). simple zygote
(c). spread flower seeds
(d). diploid zygote
(e). Chemical energy
(f). peachleaf willow
(g). duplex zygote
(h). reproductive zygote
The answer is:
(d).