Which of the following statements are true?
A. Algae contain chlorophyll.
B. Algae can prepare their own food.
C. Algae do not require water for photosphythesis.
D. Algae need oxygen as raw material for photosynthesis.

Options

A. A and B
B. C and D
C. A and D
D. B and C

Answer

To determine which statements about algae are true, let's analyze each statement one by one:

1. **Statement A: Algae contain chlorophyll.**
- Algae are photosynthetic organisms that contain chlorophyll, which allows them to capture light energy for photosynthesis.
- **Conclusion:** This statement is true.

2. **Statement B: Algae can prepare their own food.**
- Algae are autotrophic organisms, meaning they can produce their own food through the process of photosynthesis, using sunlight, carbon dioxide, and water.
- **Conclusion:** This statement is true.

3. **Statement C: Algae do not require water for photosynthesis.**
- Water is a crucial component of photosynthesis. Algae, like other photosynthetic organisms, require water to carry out the process of photosynthesis.
- **Conclusion:** This statement is false.

4. **Statement D: Algae need oxygen as a raw material for photosynthesis.**
- During photosynthesis, algae produce oxygen as a byproduct. They do not require oxygen as a raw material; instead, they use carbon dioxide.
- **Conclusion:** This statement is false.

**Final Summary:**
- Statements A and B are true.
- Statements C and D are false.

### Final Answer:
The true statements are:
- A. Algae contain chlorophyll.
- B. Algae can prepare their own food.