Radula and water vascular system are found in organism A and organism B respectively. Identify A and B.

Options

A. A - Locusta, B - Chiton
B. A - Sea hare , B - Betta
C. A - Tusk shell , B - Sea urchin
D. A - Apis , B - Bombyx

Answer

To solve the question regarding the identification of organisms A and B based on the characteristics of radula and water vascular system, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Characteristics**:
- **Radula**: This is a tongue-like organ found in certain mollusks, used for feeding. It is primarily associated with organisms in the phylum Mollusca.
- **Water Vascular System**: This is a unique system found in echinoderms (phylum Echinodermata), which aids in locomotion, feeding, and gas exchange.

2. **Identify Organism A**:
- Since radula is associated with mollusks, we need to identify an organism that possesses this feature. Common examples include snails, slugs, and chitons. For this question, we can identify **Organism A** as **Chiton** (a type of mollusk).

3. **Identify Organism B**:
- The water vascular system is characteristic of echinoderms. A common example of an echinoderm is a sea urchin. Therefore, we can identify **Organism B** as **Sea Urchin** (C-Echinoderm).

4. **Final Identification**:
- Based on the analysis, we conclude that:
- **Organism A (with radula)**: Chiton (Phylum Mollusca)
- **Organism B (with water vascular system)**: Sea Urchin (Phylum Echinodermata)

### Conclusion:
- Organism A is **Chiton** and Organism B is **Sea Urchin**.