Question

Raphides are excretory materials of-

• A. Porifera
• B. Plant
• C. Cnidaria
• D. All of these

Answer 1

The correct option is B

Plant

The correct option is B:

Explanation of the correct option:

1. Plants, unlike animals, lack a distinct excretory system for removing waste products.
2. Plants, like animals, create waste, albeit at a slower rate and in smaller quantities. Plants dispose of their waste products in a variety of ways.
3. Some of the waste products remain stored in various parts of the body.
4. Raphides (calcium-carbonate crystals), natural rubber, gums, resins, and other materials are produced by this waste.
5. Raphides and rubber are solid waste products found in plants.

Explanation of the incorrect option:

Option A:

The excretory material of Porifera is ammonia.

Option C:

Because there is no excretory system or organs, nitrogenous wastes simply diffuse from the animal's cells into the surrounding water or into the gastrovascular canal.

Option D:

The correct option plants.

Final answer: Raphides are excretory materials of Plants.