Question

Aquatic animals in which fertilisation occurs in water are said to be:

• A. viviparous without fertilisation.
• B. oviparous with external fertilisation.
• C. viviparous with internal fertilisation.
• D. oviparous with internal fertilisation.

Answer 1

The correct option is B

oviparous with external fertilisation.

The correct option is B.

Explanation for correct option:

1. In several aquatic animals, fertilization takes place outside i.e. in water. Both the sexes releasing their gamete (sperm and egg ) in water which then fuses to form a zygote.
2. As fertilization occurs outside the body so it is referred as external fertilization and such animals lays eggs in the water and are oviparous as the embryo development occurs in the egg.
3. It also results in increased genetic variations produceing a larger number of offspring.
4. For examples in frogs female releases the eggs into the water and the male releases the sperms in the water in order to fertilize them. The larval life of the frogs happens in water and the adult life is on land.

Final answer: Aquatic animals in which fertilisation occurs in water are said to be oviparous with external fertilisation.