From where do the plants get the supply of hydrogen?

Explanation

**Step-by-Step Solution:**

1. **Understanding Plant Nutrition**: Plants require various nutrients for growth, one of which is hydrogen. To determine where plants get hydrogen, we must first understand their nutritional processes.

2. **Photosynthesis Process**: Green plants produce their food through a process called photosynthesis. This process primarily involves the use of carbon dioxide (CO2), water (H2O), and sunlight.

3. **Role of Water**: Water is a crucial component in photosynthesis. Plants absorb water from the soil through their roots. The chemical formula for water is H2O, which contains hydrogen.

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