The process in which water is split during photosynthesis is

Options

A. RuBP carboxylase
B. Hexokinase
C. Phosphatase
D. Nuclease

Answer

**Step-by-Step Solution:**

1. **Understanding Photosynthesis**: Photosynthesis is the process by which plants convert light energy into chemical energy, using carbon dioxide and water. This process occurs mainly in the chloroplasts of plant cells.

2. **Role of Water in Photosynthesis**: Water is a crucial reactant in photosynthesis. It provides the necessary protons (H+) and electrons needed for the synthesis of glucose and also releases oxygen as a by-product.

3. **Light Energy Requirement**: The splitting of water molecules requires light energy. This energy is absorbed by chlorophyll, the green pigment in plants, which initiates the process.

4. **Splitting of Water**: During photosynthesis, water (H2O) is split into its components: protons (H+), electrons (e-), and oxygen (O2). This reaction can be summarized as:
\[ 2H_2O \xrightarrow{\text{light energy}} 4H^+ + 4e^- + O_2 \]

5. **By-Product Formation**: The oxygen produced during this reaction is released into the atmosphere as a by-product, which is essential for the survival of aerobic organisms.

6. **Terminology**: The process of splitting water in the presence of light is specifically termed "photolysis".

7. **Conclusion**: Therefore, the correct answer to the question is that the process in which water is split during photosynthesis is called photolysis.

**Final Answer**: The process in which water is split during photosynthesis is photolysis.

---