CBSE Class 11 PSA Biology Sample Paper Set B

We are all aware of certain remarkable discoveries in the medical sciences. For instance, we know about the discovery of vaccines. We can appreciate the prevention of such diseases as small pox and polio. We also know about many common antibiotics. The knowledge that we can control the spread of syphilis with penicillin and tuberculosis with isoniazid is somewhat comforting. We could in fact, become lulled into the belief that infectious diseases no longer pose a threat. This of course, is not true, and recent reports in newspapers and medical journals remind us of the various and sometimes new threat of infectious diseases.

Such reports admit to a more realistic view. This view implies that infectious diseases are here to stay and that they pose certain abilities to fight against our attempt to destroy them. Certain human pathogens such as genorrhoeae, for example have developed strains resistance to certain antibiotics.

Read the passage carefully and answer the questions:

1. Prevention of diseases like small pox and polio has been possible because of the discovery of

a) Penicillin

b) Isoniazid

c) Vaccines

d) Antibiotics

2. What has not been possible so far through the discoveries in the medical sciences?

a) Prevention of small pox and polio

b) Possibility of controlling the spread of syphilis with penicillin

c) Eradication of infectious diseases

d) Possibility of controlling the spread of tuberculosis with isoniazid

3. How do some of the infectious diseases fight against our efforts to destroy them?

a) By shifting to other areas

b) By developing resistance to vaccines

c) By remaining as elusive as before

d) By getting deeper into the human system

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