Which one is incorrect ?

Options

A. Nematocyst-Cnidaria
B. Colloblast-Ctenophora
C. Trichocyst-Ciliata
D. None of the above.

Answer

To determine which statement is incorrect regarding the features of cnidarians and ctenophores, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Analyze the First Option: Nematocyst of Cnidaria**
- Nematocysts, also known as cnidoblasts, are specialized cells found in cnidarians (phylum Cnidaria).
- They are responsible for capturing prey and can deliver toxins to paralyze or kill the prey.
- This statement is correct.

2. **Analyze the Second Option: Coloblasts of Ctenophora**
- Coloblasts are specialized cells found in ctenophores (phylum Ctenophora).
- They are unique to ctenophores and function to capture food, typically small plankton.
- This statement is also correct.

3. **Analyze the Third Option: Trichocyst in Ciliata**
- Trichocysts are rod-like structures found in certain protozoans, particularly in the group known as ciliates (phylum Ciliophora).
- They are used for defense and capturing prey.
- This statement is correct as well.

4. **Analyze the Fourth Option: None of the Above**
- Since all the previous statements (1, 2, and 3) are correct, the statement "none of the above" implies that there are no incorrect statements among the options provided.
- Therefore, this statement is also correct.

### Conclusion:
Since all the options presented (1, 2, and 3) are correct, the answer to the question "Which one is incorrect?" is **none of the above**.