Bursting of contractile vacuole to throw its contents is

Options

A. Ephagy
B. Systole
C. Diapause
D. Dehydration

Answer

To answer the question regarding the bursting of contractile vacuoles to expel their contents, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Contractile Vacuoles**:
- Contractile vacuoles are specialized organelles found in certain protozoans. Their primary function is to regulate the water content within the cell.

2. **Function of Contractile Vacuoles**:
- These vacuoles fill with excess water that enters the cell. This process is known as diastole, where the vacuole expands to accommodate the incoming water.

3. **Process of Expulsion**:
- When the contractile vacuole is full, it needs to expel the excess water and waste products. This process involves the vacuole contracting and ultimately bursting to release its contents outside the cell.

4. **Terminology**:
- The contraction and bursting of the vacuole to expel its contents is referred to as systole. This is the action that occurs after diastole, where the vacuole contracts to push out the contents.

5. **Identifying the Correct Answer**:
- The question asks for the term that describes the bursting of the contractile vacuole. Based on the explanation, the correct answer is **B. systole**.

### Final Answer:
The bursting of contractile vacuoles to throw its contents is **B. systole**.

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