Euglenoids have two photosensitive structures one is eye spot. The other is

Options

A. 1)Pusule
B. 2)Basal granule
C. 3)Paraflagellar body
D. 4)Pyrenoid

Answer

To solve the question regarding the photosensitive structures in Euglenoids, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Euglenoids**:
- Euglenoids are a group of protists that have unique features, including flagella and photosensitive structures.

2. **Identify the Known Photosensitive Structure**:
- The question states that one of the photosensitive structures in Euglenoids is the eye spot. This is a well-known feature that helps the organism detect light.

3. **Determine the Other Photosensitive Structure**:
- We need to identify the second photosensitive structure in Euglenoids. The options provided are:
- a) Usule
- b) Basal granule
- c) Para-flagellar body
- d) Pyrenoid

4. **Evaluate the Options**:
- **Usule**: This is not a recognized structure in Euglenoids.
- **Basal granule**: This is also not known as a photosensitive structure.
- **Para-flagellar body**: This is indeed a recognized photosensitive structure in Euglenoids, located near the flagella.
- **Pyrenoid**: This is involved in carbon fixation and is not a photosensitive structure.

5. **Select the Correct Answer**:
- Based on the evaluation, the correct answer is **c) Para-flagellar body**.

### Final Answer:
The other photosensitive structure in Euglenoids, besides the eye spot, is the **Para-flagellar body**.

---