In Paramecium, the phenomenon of cyclosis is associated with:

Options

A. digestion
B. excretion
C. locomotion
D. reproduction

Explanation

To solve the question regarding the phenomenon of cyclosis in Paramecium, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Paramecium**:
- Paramecium is a unicellular organism that has cilia covering its surface. These cilia play a crucial role in its movement and feeding.

2. **Define Cyclosis**:
- Cyclosis refers to the streaming movement of the cytoplasm within a cell. This movement allows for the distribution of nutrients and other cellular materials.

3. **Identify the Role of Cyclosis in Paramecium**:
- In Paramecium, cyclosis occurs within the food vacuole after the organism engulfs food. The cytoplasmic streaming helps in the mixing and distribution of food particles within the vacuole.

4. **Link Cyclosis to Cellular Processes**:
- The primary function of cyclosis in Paramecium is to facilitate the digestion of food. As the cytoplasm streams, it helps in breaking down food particles and distributing the nutrients.

5. **Evaluate the Options**:
- The options provided are Digestion, Excretion, Locomotion, and Reproduction. Since cyclosis is directly involved in the digestion process by aiding in the breakdown and distribution of food, the correct answer is Digestion.

6. **Conclude the Answer**:
- Therefore, the phenomenon of cyclosis in Paramecium is associated with **Digestion**.

### Final Answer:
The phenomenon of cyclosis in Paramecium is associated with **Digestion**.