Which of the following statements about Euglena is correct?

Options

A. Euglena is a flagellate organism.
B. Euglena when placed in continous darkness, loses its photosynthetic activity and dies.
C. The pigments of Euglena are quite different from those of green plants.
D. Euglena is a marine protist.

Explanation

To determine which statement about Euglena is correct, let's analyze each option step by step:

1. **Understanding Euglena**:
- Euglena is a unicellular organism that belongs to the phylum Euglenozoa. It exhibits both autotrophic (can produce its own food through photosynthesis) and heterotrophic (can consume food from external sources) modes of nutrition.

2. **Evaluating the Options**:
- **Option A**: "Euglena is a flagellate organism."
- **Analysis**: Euglena has a flagellum, which it uses for locomotion. This statement is correct.

- **Option B**: "Euglena, when placed in continuous darkness, loses its photosynthetic activity and dies."
- **Analysis**: While Euglena can photosynthesize, it can also survive by consuming food from external sources. Therefore, this statement is incorrect.

- **Option C**: "The pigments of Euglena are quite different from those of green plants."
- **Analysis**: Euglena contains chloroplasts and chlorophyll, similar to green plants. Thus, this statement is also incorrect.

- **Option D**: "Euglena is a marine protist."
- **Analysis**: Euglena is primarily found in freshwater environments, not marine environments. This statement is incorrect.

3. **Conclusion**:
- The only correct statement about Euglena is **Option A**: "Euglena is a flagellate organism."