Question

Why do frogs and fishes lay hundreds of eggs at a time but why do hens lay eggs only one at a time?

Answer 1

Hint: Frogs and Fishes are aquatic animals. Hens are terrestrial animals. The difference in fertilization sites. And they both have different developing processes.

Complete step by step answer:
 Compared to hens, fish and frogs lay hundreds of eggs because:
- In Fish and Frogs, external fertilization occurs.
- In the external medium (water), the male releases a large number of gametes while the female parent lays a large number of eggs.
- Eggs and sperm may be transported over long distances or eaten by predators present in the medium, resulting in the loss of the gametes.
- Therefore, in fishes and frogs, male and female gamete fertilization is an incentive factor, and it also depends on nature.
Therefore, a large number of gametes in these species are produced to increase the chances of fertilization.
Although, on the other hand, the development of eggs in the hen takes place inside the uterus, the loss of gamete does not also take place in the hen, the formation of zygotes is not regulated by nature.

Additional information: External fertilization is a mode of reproduction in which the sperm of a male organism fertilizes the egg of a female organism outside the body of the female. In comparison to internal fertilization, sperm are inserted by insemination and then mixed with an egg within a female organism's body. Usually, external fertilization occurs in water or a damp environment to promote the movement. Spawning is known as the release of eggs and sperm into the water. In motile species, spawning females frequently migrate to an appropriate location to release their eggs. Sessile animals, however, are less capable of traveling to spawning locations and must locally release gametes. In amphibians and fish, external fertilization is most common among vertebrates.

Note: Frogs are amphibians because, as eggs in the water, they begin their frog life cycle and then develop into tadpoles that have gills and also live in the water. It is not when a tadpole transforms into a frog that it can survive outside the water, but to drink and cool off, it will always need to get in the water.