Cnidoblasts are not used for :-

Options

A. Anchorage
B. Locomotion and defence
C. Capture of prey
D. Reproduction

Answer

### Step-by-Step Solution:

1. **Understanding Cnidoblasts**:
- Cnidoblasts, also known as cnidocytes, are specialized cells found in cnidarians (like jellyfish, corals, and sea anemones).
- They contain a unique organelle called a nematocyst, which is capable of delivering a sting.

2. **Functions of Cnidoblasts**:
- The primary functions of cnidoblasts include:
- **Capturing Prey**: The nematocysts can inject venom into prey, immobilizing them for feeding.
- **Defense**: Cnidoblasts can also be used to deter predators, providing a defense mechanism.
- **Locomotion**: While not their primary function, cnidoblasts can contribute to the movement of the organism by helping in the contraction of muscles.

3. **Identifying the Incorrect Function**:
- The question asks for the function that cnidoblasts are NOT used for.
- The options given include:
- A) Capture of prey
- B) Locomotion
- C) Defense
- D) Reproduction

4. **Analyzing the Options**:
- **Capture of Prey**: Cnidoblasts are indeed used for this purpose.
- **Locomotion**: While cnidoblasts can aid in movement indirectly, they are not primarily responsible for locomotion.
- **Defense**: Cnidoblasts are used for defense against predators.
- **Reproduction**: Cnidoblasts are not involved in the reproductive processes of cnidarians.

5. **Conclusion**:
- The correct answer is **D) Reproduction**, as cnidoblasts are not used for reproduction.