1. AIDS stands for _______

2. Read the following paragraph and answer the following question.
Hershey-Chase experiment broke the barriers of science and expanded the understanding of life. In this experiment, two sets of bacteriophages are used in which one contains radioactive sulphur in its protein coat (Set-I) and other contains radioactive phosphorus in its DNA (Set-II). These two sets were allowed reproduce in E.Coli culture and then centrifuged.
Which among the following are correct Set-I and Set-II after centrifugation?

3. Viruses contain sheath made of ______

4. Lichens are indicators of pollution because ________

5. Who proved that viruses are crystalline like structures?

6. Which among the following is odd?

7. The fungal portion in Lichens is known as _________

8. Which among the following are incorrect about Viruses?

9. Viruses are living organisms.

10. Which among the following is not a difference between viruses and viroids?

11. The word “Virus” means ______

12. Viruses are smaller than viroids.

13. Who discovered viroids?

14. Why are viruses not included in any of the five kingdoms?

15. Viruses are an example of ________

16. Which among the following is incorrect about the following figure?

17. Viruses in animals contain both RNA and DNA.

18. RNA of the viroids is of low molecular weight when compared to viruses.

19. Viruses that infect bacterium are called as _________

20. Viruses that infect plants have ________