A dinoflagellate that emit light at night

Options

A. 1)Desmid
B. 2)Noctiluca
C. 3)Euglena
D. 4)Diatom

Answer

### Step-by-Step Solution:

1. **Understanding Dinoflagellates**:
- Dinoflagellates are a type of protist that are known for their unique characteristics, including the presence of pigments that allow them to perform photosynthesis and bioluminescence.

2. **Identifying Bioluminescence**:
- Bioluminescence is the ability of an organism to produce light through a biochemical reaction. This process involves a pigment called luciferin and an enzyme called luciferase, which together produce light without generating heat.

3. **Analyzing the Options**:
- The question provides four options:
1. Decimate
2. Noctiluca
3. Uglina
4. Diatom
- We need to identify which of these is a dinoflagellate that emits light at night.

4. **Evaluating Each Option**:
- **Decimate**: Not known as a dinoflagellate.
- **Noctiluca**: This is a dinoflagellate known for its bioluminescent properties, emitting light at night.
- **Uglina**: Not a dinoflagellate.
- **Diatom**: Diatoms are a different group of algae and do not exhibit bioluminescence.

5. **Conclusion**:
- Based on the analysis, the correct answer is **Noctiluca**, as it is a dinoflagellate that emits light at night.

### Final Answer:
The dinoflagellate that emits light at night is **Noctiluca**.