Biology 9 Chapter 4 - Test 1

1. Viruses can be observed with light microscope.

2. Viruses are discovered in 1982.

3. All viruses are parasites and may be responsible for producing different diseases in their host.

4. Influenza is a disease caused by bacteria.

5. Bacteria were discovered by Louis Pasteur.

6. Cocci are rounded in shape.

7. In bacteria enzymes needed for respiration are found on the invaginations of cell membrane.

8. In photosynthetic bacteria chemical structure of chlorophyll is different from plant chlorophyll.

9. Bacteria which obtain food from dead organic matter are known as photosynthetic.

10. Denitrifying bacteria in soil, enhance the amount of nitrogen in soil.

11. Whooping cough is the disease caused by bacteria.

12. Cyanobacteria are also known as red algae.

13. Viruses are the organisms having characteristics of both living and non-living things.

14. Bacterium is a unicellular organism, which has an organized uncleus.

15. Some viruses synthesize vitamin �B� and �K� in the large intestine of mammals.

16. Bacteria synthesize cellulase enzyme in the stomach of herbivore animals which helps in the digestion of food.

17. The bacteria, which live on other living organisms for their nutrition and survival, are called saprotrophic.

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