Fertilisation in Animals: External vs Internal · Zoology

Which of the following best defines external fertilisation in animals?

  1. Fusion of gametes inside the female reproductive tract of the parent
  2. Fusion of gametes outside the parents' bodies
  3. Fusion of gametes within specialized reproductive organs
  4. Fusion of gametes only in terrestrial habitats
Show answer and explanation

Correct answer: Fusion of gametes outside the parents' bodies

External fertilisation occurs when male and female gametes fuse outside the body, usually in water. It is common in many aquatic animals like fishes and amphibians.

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