How many of the following cell organelles are found only in animal cells and not in plant cell?
A -Cell wall B- Centriole C - Chloroplast D Mitochondria E - 80S ribosomes

Options

A. 1
B. 2
C. 3
D. 4

Answer

To determine how many of the listed cell organelles are found only in animal cells and not in plant cells, we will analyze each organelle one by one:

1. **Cell Wall (A)**:
- The cell wall is a rigid outer layer found in plant cells. It provides structural support and protection. Animal cells do not have a cell wall; instead, they have a flexible plasma membrane.
- **Conclusion**: Cell wall is found only in plant cells.

2. **Centriole (B)**:
- Centrioles are cylindrical structures found in animal cells. They play a crucial role in cell division by helping to organize the microtubules that separate chromosomes.
- **Conclusion**: Centrioles are found only in animal cells.

3. **Chloroplast (C)**:
- Chloroplasts are organelles that conduct photosynthesis in plant cells, containing chlorophyll, the green pigment. They are not present in animal cells.
- **Conclusion**: Chloroplasts are found only in plant cells.

4. **Mitochondria (D)**:
- Mitochondria are known as the powerhouses of the cell, responsible for producing energy (ATP) through cellular respiration. They are present in both plant and animal cells.
- **Conclusion**: Mitochondria are found in both plant and animal cells.

5. **80S Ribosomes (E)**:
- Ribosomes are the sites of protein synthesis. The 80S ribosomes are found in eukaryotic cells, which include both plant and animal cells.
- **Conclusion**: 80S ribosomes are found in both plant and animal cells.

Now, let's summarize the findings:
- Only **Centriole (B)** is found exclusively in animal cells.

**Final Answer**: 1 organelle (Centriole) is found only in animal cells and not in plant cells.