In which of the following, trichocyst is present?

Options

A. Hydra
B. Amoeba
C. Plasmodium
D. Paramecium

Answer

To determine which organism has trichocysts, we can analyze the options given:

1. **Understanding Trichocysts**:
- Trichocysts are thread-like structures that can be released by certain organisms in response to stimuli. They serve various functions, including defense mechanisms against predators.

2. **Analyzing the Options**:
- **Option A: Hydra**: Hydra is a freshwater organism known for its tentacles and stinging cells called nematocysts, but it does not possess trichocysts.
- **Option B: Amoeba**: Amoeba is a unicellular organism that uses pseudopodia for movement and feeding. It does not have trichocysts.
- **Option C: Plasmodium**: Plasmodium is a genus of parasitic protozoa that causes malaria. It does not have trichocysts.
- **Option D: Paramecium**: Paramecium is a ciliated protozoan known for its slipper-like shape. It has trichocysts, which it uses as a defense mechanism against predators.

3. **Conclusion**:
- Based on the analysis, the organism that possesses trichocysts is **Option D: Paramecium**.