Grana are

A

Protein storing plastids

B

Coloured plastids

C

Stacks of thylakoids

D

Individual thylakoids present in stroma

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Grana**: Grana are structures found within chloroplasts, which are organelles responsible for photosynthesis in plant cells. They play a crucial role in the light-dependent reactions of photosynthesis. 2. **Chloroplast Structure**: Chloroplasts are double-membranous organelles. They consist of an outer membrane and an inner membrane, enclosing a space filled with a fluid called stroma. 3. **Thylakoids**: Inside the chloroplast, there are flattened, disc-like structures called thylakoids. These thylakoids are the sites where the light-dependent reactions of photosynthesis take place. 4. **Stacks of Thylakoids**: Grana are formed by stacks of these thylakoids. Each stack is referred to as a granum (singular of grana). This structure increases the surface area for light absorption and the efficiency of photosynthesis. 5. **Connecting Grana**: The thylakoids are interconnected by stroma thylakoids (also known as stromal lamellae), which help in linking the grana together. 6. **Identifying the Correct Option**: - Option 1: Protein storing plastids - Incorrect (these are called alluroplasts). - Option 2: Colored plastids - Incorrect (these are known as chromoplasts). - Option 3: Stack of thylakoids - Correct (this is the definition of grana). - Option 4: Individual thylakoids present in stroma - Incorrect (individual thylakoids are not called grana). 7. **Conclusion**: The correct answer to the question "Grana are" is option 3, which states that grana are stacks of thylakoids. ---
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