Which of the following is not a function of water in plants?

Options

A. It is responsible for cell elongation
B. It maintains the turgidity of cells
C. It acts as a source of energy
D. It provides medium for enzymatic activities

Answer

To determine which of the following is not a function of water in plants, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understand the Role of Water in Plants**: Water is essential for various physiological processes in plants. It plays a critical role in maintaining structure, facilitating biochemical reactions, and transporting nutrients.

2. **Evaluate Each Option**:
- **Option 1: Responsible for cell elongation**: Water is indeed crucial for cell elongation. It enters the cells, causing them to swell and elongate, which is vital for plant growth.
- **Option 2: Maintains the turgidity of the cell**: Water helps maintain turgidity in plant cells. Turgidity is the pressure of the cell contents against the cell wall, which is maintained by water entering the cell through osmosis.
- **Option 3: Acts as a source of energy**: This statement is incorrect. Water does not act as a source of energy for plants. Instead, plants derive energy from sunlight through photosynthesis, where water is a reactant but not a source of energy itself.
- **Option 4: Provides a medium for enzymatic activities**: Water is indeed a medium for many enzymatic reactions in plants. It facilitates the interaction between enzymes and substrates.

3. **Identify the Incorrect Function**: Based on the evaluations, the option that does not represent a function of water in plants is **Option 3: It acts as a source of energy**.

4. **Conclusion**: Therefore, the correct answer to the question is **Option 3**.