Which one of the following statement is correct?

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All animals require a medium for cellular respiration.

In all animals, oxygen is transported by blood.

All animals need oxygen for respiration.

All animals have specialized respiratory organs for respiration

answer is A.

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Detailed Solution

All animals require a medium for cellular respiration. Cellular respiration is the process of oxidizing food molecules, like glucose, to carbon dioxide and water. The energy released is trapped in the form of ATP for use by all the energy-consuming activities of the cell. Some animals do not have specialized respiratory organs. They respire by skin.

In cockroach, oxygen is carried by tracheal system.

Some animals perform anaerobic respiration (absence of oxygen).

Some animals respire by general body surface (e.g., sponges, jelly fishes, etc.). Not all have specialised respiratory organs.

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