Chloroplasts : Grana
:: Mitochondria : ________

Explanation

To solve the analogy "Chloroplasts : Grana :: Mitochondria : ________", we need to understand the relationship between the components of chloroplasts and mitochondria.

### Step-by-Step Solution:

1. **Understanding Chloroplasts and Grana**:
- Chloroplasts are the organelles in plant cells responsible for photosynthesis.
- Grana are stacks of thylakoid discs within the chloroplasts where the light-dependent reactions of photosynthesis occur.

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