Question

Cutaneous respiration is not a characteristic of which of the following animal?

• A. Frog
• B. Leech
• C. Earthworm
• D. Hydra

Answer 1

The correct option is D Hydra

• Gaseous exchange in frog, leech and earthworm is through the general body surface exposed to the external environment. The skin is richly supplied with the blood capillaries.
  
• While respiration in Hydra occurs in the cell lining the gastrovascular cavity in a way that surface lining of the enteron acts as an efficient respiratory surface.

So, the correct option is 'Hydra'.