Which of the following represent correct set of organisms with their respective respiratory organ ?

Correct option is A

Correct Answer: A — (A)-(II), (B)-(III), (C)-(IV), (D)-(I)
Explanation:
1. Earthworm → Skin (II)

Earthworms do not have lungs or gills.
They respire through their moist skin, where oxygen diffuses directly into the blood vessels.
This is called cutaneous respiration.

2. Cockroach → Tracheal system (III)

Cockroaches breathe through a network of thin tubes called tracheae.
Air enters through small openings called spiracles.
This is known as tracheal respiration, characteristic of insects.

3. Dolphin → Lungs (IV)

Dolphins are mammals, not fish.
They must come to the surface to breathe air through their lungs, using a blowhole.
They cannot extract oxygen from water.

4. Snail → Gill (I)

Most aquatic snails have gills (ctenidia) for respiration under water.
Even many land snails possess a modified lung-like cavity, but in NCERT context, snail is matched with gills.