Chloroplasts

Options

A. Are found in all plant cells
B. Have chlorophyll as their only pigment
C. Do not contain any DNA and rely totally on the genes in the nucleus for the coding of their required proteins
D. Are involved in the synthesis of sugar

Answer

**Step-by-Step Solution:**

1. **Understanding Chloroplasts:**
- Chloroplasts are organelles found in plant cells that are crucial for photosynthesis. They contain pigments that capture light energy.

2. **Analyzing the Options:**
- **Option A:** "Found in all plant cells."
- This statement is incorrect. While chloroplasts are present in most plant cells, they are absent in certain cells, such as those in underground parts of the plant (roots, bulbs) where sunlight does not reach.

- **Option B:** "Have chlorophyll as their only pigment."
- This statement is also incorrect. Chloroplasts contain chlorophyll, but they also have other pigments, such as carotenoids, which contribute to photosynthesis and give color to plants.

- **Option C:** "Do not contain any DNA and rely totally on genes in the nucleus for the coding of their required proteins."
- This statement is incorrect. Chloroplasts contain their own DNA and can replicate independently of the nuclear DNA. They are semi-autonomous, meaning they can produce some of their own proteins but still rely on the nucleus for others.

- **Option D:** "Are involved in the synthesis of sugar."
- This statement is correct. Chloroplasts are responsible for photosynthesis, where they convert inorganic materials (like carbon dioxide and water) into glucose (sugar) using sunlight.

3. **Conclusion:**
- Based on the analysis of the options, the correct answer is **Option D: They are involved in the synthesis of sugar.**

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