ICSE Class 9 Answered

1. Very small in size

1. Larger in size

2. Visible only under an electron microscope

2. Visible under a light microscope

3. Non-cellular

3. Single-celled

4. Have no metabolism

4. Have metabolism

5. Do not take any food

5. Take food by absorption

6. Do not grow and divide

6. Grow in size and divide to produce more bacteria

7. Can be crystallized

7. Cannot be crystallized

8. Command the host cell to produce virus

8. Self-reproducing

9. All produce diseases in man, animals or plants

9. Some harmless, some useful and some disease-producing