Question

External fertilization mostly occurs in those animals which

• A. Lay eggs in soil
• B. Lay eggs in water
• C. Are viviparous
• D. Are oviparous

Answer 1

Answer: (B)

Lay eggs in water

External fertilization is a method of fertilization in which a sperm cell fuses with an egg cell in the open. Most species of fish and amphibia reproduce by external fertilization. It usually occurs in aquatic environments, where both eggs and sperm are released into the water. After the sperm reaches the egg, fertilization can then take place. Hence, the correct answer is option B.