Question

The respiratory organ of tadpole is
A. Skin
B. Lung
C. Gill
D. Air bladder

Answer 1

Hint: This structure is mostly present in aquatic animals to help them breathe underwater. The other respiratory structures are developed during metamorphosis.

Complete Answer:
- Frogs have the ability to undergo metamorphosis. It begins its life cycle as a tadpole and undergoes several stages of development before they finally mature into adult frogs.
- When the tadpole hatches, it looks like a small fish with a tail. It has gills that allow it to breathe underwater. Tadpoles have small flaps on the outer gill that draw oxygen from water as it flows through them.
- The tadpole develops for several weeks feeding on plants and algae from the water. The tadpole continues to grow lungs at this period, so that it can breathe out of the water when it becomes a frog.
- Also the tadpole begins to develop two hind legs. The two front legs develop on the tadpole, and its long tail gets shorter and shorter. The tadpole uses the nutrients stored in its tail as food.
- The tail disappears entirely from the body after some time and the tadpole becomes a small frog, sometimes referred to as a froglet. It rises from the water and becomes completely carnivorous, breathing both through its wet skin and by its lungs.

Thus, the correct answer is gill.

Note: Tadpoles have the ability to control the rate of their transformation according to their environment. They may quicken the process of development into frogs in order to escape from predators like fish. On the other hand, if there is plenty of food in the pond, without the threat of predators, or in cold climates, tadpoles can delay and remain in the water for up to a year.