Stroma in the chloroplasts of higher plant cantains

Options

A. Chlorophyll
B. Light-independent reaction enzymes
C. Light- dipendent reaction enzymes
D. Ribosomes

Answer

**Step-by-Step Solution:**

1. **Understanding Chloroplasts**: Chloroplasts are specialized organelles found in plant cells that play a crucial role in photosynthesis, the process by which plants convert light energy into chemical energy.

2. **Structure of Chloroplasts**: Chloroplasts consist of various components, including the outer membrane, inner membrane, thylakoids, and stroma. The thylakoids are organized into stacks called grana, where the light-dependent reactions of photosynthesis occur.

3. **Function of Stroma**: The stroma is the fluid-filled space surrounding the thylakoids. It is where the light-independent reactions (also known as the Calvin cycle or dark reactions) take place. During these reactions, carbon dioxide is fixed into organic molecules using the energy produced in the light-dependent reactions.

4. **Components of Stroma**: The stroma contains various substances, including enzymes that facilitate the light-independent reactions. It also contains ribosomes and DNA, which are involved in the synthesis of proteins and replication of chloroplast genetic material.

5. **Analyzing the Options**:
- **Chlorophyll**: This pigment is essential for capturing light energy but is located in the thylakoid membranes, not the stroma.
- **Light-independent reaction enzymes**: These enzymes are present in the stroma and are crucial for the Calvin cycle, making this option correct.
- **Ribosomes**: While ribosomes are present in the stroma, they are not the primary focus of the question.
- **Light-dependent reaction enzymes**: These are located in the thylakoid membranes, not in the stroma.

6. **Conclusion**: The stroma in the chloroplasts of higher plants contains enzymes that facilitate the light-independent reactions of photosynthesis.

**Final Answer**: The stroma in the chloroplasts of higher plants contains light-independent reaction enzymes.

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