Question

Form of respiration possible in frog who is swimming in a pool with his head held above water is ______________.

• A. Cutaneous only
• B. Pulmonary only
• C. Gills only
• D. Both (1) and (2)

Answer 1

The correct option is D Both (1) and (2)

D. Both (1) and(2)

Reason : When a frog is swimming in a pool with its head held above the water, it can respire through two processes while completely submerged all of the frog's respiration takes place through the skin. this kind of respiration is called cutaneous respiration. The skin is composed of thin membranous tissue that is quite permeable to water and contains a large network of blood vessels. The thin membranous skin allows the respiratory gases to readily diffuse down their gradients between the blood vessels and the surroundings. When the frog is out of the water, mucus glands in the skin keep the frog moist, which helps absorb dissolved oxygen from the air and it can respire through the lungs, known as pulmonary respiration. Frogs also have a respiratory surface on the lining of their mouth on which gas exchange takes place readily.

So the correct option is D.