_____ supplies water for photosynthesis.

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Photosynthesis**: Photosynthesis is the process by which plants synthesize food using sunlight, carbon dioxide, and water. It occurs primarily in the leaves of the plant.

2. **Role of Water in Photosynthesis**: Water is essential for photosynthesis as it undergoes a process called photolysis. During photolysis, water molecules are split to release hydrogen ions (H+), electrons, and oxygen. The released oxygen is a byproduct and is released into the atmosphere.

3. **Transpiration and Water Supply**: The water required for photosynthesis is supplied through a process known as transpiration. Transpiration is the loss of water vapor from the aerial parts of the plant, especially through small openings called stomata located on the leaves.

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