Question

Different types of respiratory organs like gills,book gills, book lugs and trachea are present in

• A. Annelids
• B. Sponges
• C. Molluscs
• D. Arthropods

Answer 1

The Correct Option is D

The correct answer is: Option 4: Arthropods

Explanation:

Arthropods possess a variety of respiratory organs depending on the class and environment they inhabit. For example:

Gills are found in aquatic arthropods like crustaceans (e.g., crabs and lobsters).

Book gills are found in some arachnids like horseshoe crabs.

Book lungs are found in some arachnids like spiders.

Trachea is a respiratory system in insects, where air tubes deliver oxygen directly to tissues.

The other options are incorrect because:

Annelids (Option 1) mainly have skin or gills for respiration (e.g., earthworms).

Sponges (Option 2) do not have specialized respiratory organs; they rely on water flow to exchange gases.

Molluscs (Option 3) generally have gills (e.g., in aquatic mollusks) or lungs (e.g., in terrestrial snails).

Thus, arthropods are the group with diverse respiratory organs like gills, book gills, book lungs, and trachea.

Answer 2

Let's consider the respiratory organs of each phylum:

• Annelids: Some aquatic annelids use gills. Many terrestrial annelids respire through their moist skin.
• Sponges: Sponges lack specialized respiratory organs. They rely on diffusion for gas exchange.
• Molluscs: Aquatic molluscs often use gills. Terrestrial molluscs (like snails) use a simple lung-like structure.
• Arthropods: This phylum shows the greatest diversity in respiratory structures. They possess gills (aquatic arthropods), book lungs (arachnids like spiders), book gills (horseshoe crabs) and trachea (insects).

Therefore, the correct answer is Arthropods because this phylum exhibits a wide variety of respiratory organs, including gills, book gills, book lungs, and trachea.