Most green euglenoids store their carbohydrates as

Options

A. (a) starch
B. (b) glycogen
C. (c) cellulose
D. (d) paramylon starch

Answer

To answer the question "Most green euglenoids store their carbohydrates as," we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Organism**: Recognize that we are discussing green euglenoids, which belong to the genus Euglena within the kingdom Protista.

2. **Understand Nutritional Modes**: Note that euglenoids exhibit mixotrophic nutrition. They can perform photosynthesis during the day (autotrophic) due to the presence of chlorophyll and switch to heterotrophic nutrition at night.

3. **Carbohydrate Storage**: Determine how euglenoids store carbohydrates. The transcript mentions that they produce carbohydrates through photosynthesis and store them.

4. **Specific Type of Starch**: The transcript specifies that euglenoids store their carbohydrates in the form of "para-mylon starch," which is a unique type of starch made up of a beta-1,3-polymer of glucose.

5. **Evaluate the Options**:
- **A. Starch**: Incorrect, as euglenoids store a specific type of starch.
- **B. Glycogen**: Incorrect, as glycogen is primarily stored by animals.
- **C. Cellulose**: Incorrect, as cellulose is a structural component in plants.
- **D. Paramylon starch**: Correct, as this is the specific form of carbohydrate storage in euglenoids.

6. **Conclusion**: Therefore, the correct answer is that most green euglenoids store their carbohydrates as **paramylon starch**.

### Final Answer:
Most green euglenoids store their carbohydrates as **paramylon starch**.

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