Cells which are metabolically more active, have-

Options

A. less number of mitochondria
B. more number of mitochondria
C. no relation between metabolic activities and number of mitochondria
D. no mitochondria, to provide more space in cytoplasm for metabolic activities

Answer

To answer the question "Cells which are metabolically more active, have-", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Metabolic Activity**:
- Metabolically active cells are those that engage in numerous chemical reactions, including both catabolic (breaking down molecules) and anabolic (building up molecules) processes.

2. **Role of ATP**:
- These chemical reactions require energy, which is primarily supplied in the form of ATP (adenosine triphosphate). Therefore, cells that are more active will need to produce more ATP.

3. **Mitochondria's Function**:
- Mitochondria are known as the powerhouse of the cell because they are the primary sites for ATP production through aerobic respiration.

4. **Number of Mitochondria**:
- Since metabolically active cells require more ATP, they will have a higher number of mitochondria to meet this energy demand.

5. **Other Organelles**:
- In addition to mitochondria, metabolically active cells often have more endoplasmic reticulum (for protein and lipid synthesis), ribosomes (for protein synthesis), and enzymes (which facilitate biochemical reactions). The Golgi apparatus is also more prominent for processing and packaging proteins.

6. **Conclusion**:
- Therefore, the correct answer is that cells which are metabolically more active have **more mitochondria** and also an increased number of other organelles involved in metabolism.

### Final Answer:
Cells which are metabolically more active have **more mitochondria**.