Structural and functional units of chloroplasts are grana.

Answer

**Step-by-Step Solution:**

1. **Understanding the Statement**: The statement claims that the structural and functional units of chloroplasts are grana. We need to evaluate whether this statement is true or false.

2. **Defining Chloroplasts**: Chloroplasts are organelles found in plant cells that are responsible for photosynthesis. They contain chlorophyll, the green pigment that captures light energy.

3. **Identifying the Role of Grana**: Grana are stacks of thylakoids within the chloroplasts. They play a role in the light-dependent reactions of photosynthesis, where light energy is converted into chemical energy.

4. **Identifying the Correct Structural and Functional Units**: While grana are important for photosynthesis, the actual structural and functional units of chloroplasts are known as quantasomes. Quantasomes are the particles located on the thylakoid membrane and contain the photosynthetic pigments.

5. **Conclusion**: Since the statement claims that grana are the structural and functional units of chloroplasts, and we have established that quantasomes are the correct units, the statement is false.

**Final Answer**: The statement "Structural and functional units of chloroplasts are grana" is false. The correct units are quantasomes.

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