Which mineral ion is responsible for activating enzymes involved in carbon fixation during photosynthesis ?

Explanation

To answer the question regarding which mineral ion is responsible for activating enzymes involved in carbon fixation during photosynthesis, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Photosynthesis**:
- Photosynthesis is divided into two main stages: light reactions and dark reactions (Calvin cycle).
- Light reactions occur in the thylakoid membranes of chloroplasts, producing ATP and NADH.
- Dark reactions, or carbon fixation, occur in the stroma of chloroplasts, utilizing ATP and NADH to convert carbon dioxide into glucose.
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