Question

Why is an egg cell bigger than a sperm cell

Answer 1

egg contains almost all organelles, materials, and nutrition for zygote growth. That is why it is bigger then a sperm cell

I hope this answered your question :)

Answer 2

Egg cells are considerably larger than sperm cells because they carry the cytoplasm and organelles necessary for cell division and growth to begin, while sperm cells are basically a cell nucleus and a tail.