Which of the following statements is true about Euglena?

Options

A. They show flagellar locomotion
B. They have a rigid cell wall
C. They have no chloroplast
D. They are obligate autotroph

Answer

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

1. **Understanding Euglena**: Euglena is a unicellular organism classified under the kingdom Protista. It is known for its unique characteristics that blend features of both plants and animals.

2. **Evaluating the Statements**:
- **Statement A**: "Show flagellar movement."
- Euglena possesses two flagella located at its anterior end, which it uses for locomotion. This statement is true.

- **Statement B**: "Have rigid cell wall."
- Euglena does not have a rigid cell wall like plants. Instead, it has a flexible proteinaceous pellicle that allows it to change shape. This statement is false.

- **Statement C**: "Have no chloroplast."
- Euglena contains chloroplasts, which allow it to perform photosynthesis under light conditions. This statement is false.

- **Statement D**: "Are obligate autotroph."
- Euglena is not an obligate autotroph; it can also obtain nutrients through heterotrophic means, especially in the absence of light. This statement is false.

3. **Conclusion**: Based on the evaluation, the only true statement about Euglena is that it shows flagellar movement.

**Final Answer**: The correct answer is A: "Show flagellar movement."

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