Tag: breathing underwater

Questions Related to breathing underwater

The respiratory organs of larger aquatic animals are

biology respiration in living organisms breathing underwater respiration in other organisms respiration in organism

  1. Tracheae

  2. Lungs

  3. Gills

  4. Book lungs

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Correct Option: C
Explanation:

Gills are the respiratory organs of large aquatic animals. These organs are specifically adapted to their function. In Osteichthyes, the gills have four gill arches, Chondrichthyes have two, fish has 7 gill baskets with a long bony cover for the gills which is used to push water. 

Which one of the following animals has no blood but respires?

biology respiration in living organisms breathing underwater respiration in other organisms respiration in organism

  1. Earthworm

  2. Hydra

  3. Cockroach

  4. Octopus

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Correct Option: B
Explanation:

Hydra doesn't have blood. It is a single-cellular animal. In the hydra, respiration is accomplished via diffusion of molecules of oxygen and carbon dioxide through the skin whereas earthworm, cockroach and octopus has blood. Thus, option B is correct.