Grana and stroma lamellae are the parts of :–

Options

A. Mitochondria
B. Chloroplast
C. Endoplasmic reticulum
D. Vacuoles

Answer

To determine the parts of "grana" and "stroma lamellae," we need to analyze the options provided in the question step by step.

### Step 1: Understanding Grana and Stroma Lamellae
Grana and stroma lamellae are structures found within certain organelles in plant cells. Grana are stacks of thylakoids, which are the sites of the light-dependent reactions of photosynthesis. Stroma lamellae connect these stacks and are involved in the light-independent reactions.

### Step 2: Analyzing the Options
1. **Mitochondria**: This organelle is responsible for cellular respiration and energy production. It has an outer and inner membrane, with the inner membrane folded into structures called cristae. Since grana and stroma lamellae are not found in mitochondria, this option is incorrect.

2. **Chloroplast**: This organelle is the site of photosynthesis in plant cells. It contains thylakoids (which form grana) and stroma (the fluid surrounding the thylakoids). Grana and stroma lamellae are indeed parts of chloroplasts, making this option correct.

3. **Endoplasmic Reticulum**: This organelle is involved in the synthesis of proteins and lipids. It does not contain grana or stroma lamellae, so this option is also incorrect.

4. **Vacuoles**: These are storage organelles in cells that can hold various substances. They do not contain grana or stroma lamellae, making this option incorrect as well.

### Conclusion
The correct answer is that grana and stroma lamellae are parts of **chloroplasts**.

### Final Answer
Grana and stroma lamellae are parts of: **Chloroplast**.

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