Question

Which type of fertilization is found in frogs?
A) External, in water
B) Internal, in the abdomen
C) External, in the uterus
D) Internal, in the epididymis

Answer 1

Fertilization is the process of the fusion of the male and the female gametes to form the zygote, which develops into an embryo. It is of two types that are external and internal fertilization. External fertilization occurs outside the body whereas, internal fertilization occurs inside the body of an organism. The fertilization in frogs occurs outside the body.

Complete answer: Frogs are a member of the order Anura of the class Amphibia. They belong to the superclass Tetrapoda and phylum Chordata or Vertebrata. Frogs show external fertilization. Frogs have no genital organ that can help them to deposit the sperms in the female frog’s body. Therefore, fertilization occurs outside the body of the female frog. The female frog releases the eggs. At the same time, the male frog also releases the sperms. The female frog can lay from one to several hundred eggs. These eggs and sperms are released in the water. Water is very necessary for fertilization in the case of frogs. This is because the eggs of frogs are jelly-like and they do not have any protective covering around them. Due to this reason the eggs are very prone to predators. Also, they are not viable for very long periods. On land, their drying can occur. Moreover, there would be no medium to cause fertilization. Therefore, the eggs are laid in water. The sperms swim to reach the eggs and fertilize them. After fertilization, the eggs develop into tadpoles. The tadpoles further undergo metamorphosis to form frogs.
Thus, based on the above information we can conclude that the type of fertilization found in frogs is external, in water.
Hence, the correct answer is option A.

Note: The male frog climbs over the female frog to ensure that eggs are released simultaneously as sperms. The male frog clasps his forelegs around the middle of the female frog. This mating position is known as the amplexus. Frogs can stay in the posture of the amplexus for a few hours to a few days.