Which molecule acts as a reaction centre?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Reaction Center**: The reaction center is a crucial component in the process of photosynthesis, specifically during the light reactions. It is where the primary photochemical reactions occur.

**Hint**: Think about where the light energy is converted into chemical energy.

2. **Identifying the Molecule**: In higher plants, the molecule that acts as the reaction center is chlorophyll, specifically chlorophyll A.

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