Identify the reaction that takes place in stroma and mention the major steps that are involved in it.

Explanation

**Step-by-Step Solution:**

1. **Identify the Reaction in the Stroma**: The reaction that takes place in the stroma of chloroplasts is known as the "Calvin Cycle" or "Dark Reaction."

2. **Major Steps Involved**: The Calvin Cycle consists of three major steps:
- **Step 1: Carbon Fixation**: In this step, carbon dioxide (CO2) from the atmosphere is fixed into a stable intermediate. This is catalyzed by the enzyme RuBisCO, which combines CO2 with ribulose 1,5-bisphosphate (RUBP).

- **Step 2: Formation of Sugar**: The stable intermediate formed in the first step undergoes a series of reactions to produce glyceraldehyde-3-phosphate (G3P), which is a three-carbon sugar. Some of this G3P is used to form glucose and other carbohydrates.
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