Extranuclear chromosomes occur in : -

Options

A. Peroxisome, Ribosome
B. Chloroplast and Mitochondria
C. Mitochondria and Ribosome
D. Chloroplast and Lysosome

Answer

To solve the question regarding where extranuclear chromosomes occur, we can follow these steps:

### Step 1: Understand the Concept of Extranuclear Chromosomes
Extranuclear chromosomes refer to DNA that is located outside the nucleus of a cell. This DNA is often found in specific organelles that have their own genetic material.

**Hint:** Look for organelles that are known to have their own DNA separate from the nuclear DNA.

### Step 2: Identify Organelles with Extranuclear DNA
The two main organelles that contain extranuclear DNA are:
- **Mitochondria**: These organelles are responsible for energy production and have their own circular DNA, similar to bacterial DNA.
- **Chloroplasts**: Found in plant cells, chloroplasts are involved in photosynthesis and also contain their own DNA.

**Hint:** Think about the roles of mitochondria and chloroplasts and their evolutionary origins.

### Step 3: Evaluate the Options Given
Now, let's analyze the options provided in the question:
- **Option A: Peroxisome and Ribosome** - Neither of these organelles contains extranuclear DNA.
- **Option B: Chloroplast and Mitochondria** - Both of these organelles contain their own DNA, making this a strong candidate.
- **Option C: Mitochondria and Ribosome** - While mitochondria have their own DNA, ribosomes do not.
- **Option D: Chloroplast and Lysosomes** - Chloroplasts have their own DNA, but lysosomes do not.

**Hint:** Eliminate options that do not contain organelles with their own DNA.

### Step 4: Conclusion
After evaluating all options, we find that the correct answer is **Option B: Chloroplast and Mitochondria**, as both organelles possess extranuclear chromosomes.

**Final Answer:** Option B: Chloroplast and Mitochondria.