Describe the asexual and sexual phases of life cycle of Plasmodium that causes malaria in humans.

5

(a)

Why do some adolescent start taking drugs?How can this be avoided.

5

(a)

What is Pulse Polio Programme of  Government of India? What is OPV? Why is it that India is yet to eradicate Pollio.

5

(a)

Why is penicillin not effective in primary atypical pneumonia?

5

(a)

Answer the following questions:
(a) How are the cancer cells different from normals cells?
(b) Pick out correct carcinogens out of the following :
Asbestos, infra red rays, arsenic, polythene, casein, caffein, tobacco smoke, Gamma rays.
(c) Write down three methods (write full forms wherever required) to detect cancer of internal organs.

5

(a)

After consuming sugarcane juice from a roadside vendor, Monu suffered from cough. His mother advised him to cover his nose while coughting and sneezing.
Read the above passage and answer the following questions:
(i) Why did Monu fall ill?
(ii) Why did his mother advise him to cover his nose while coughting and snazing?

5

(a)

What are recombinant DNA vaccines? Give two examples of such vaccines. Discuss their advantages.

5

(a)

What is the mechanism by which the AIDS virus causes deficiency of immune system of the infected person?

5

(a)

In the given flow diagram, the replication of retrovirus in a host is shown. Observe and answer the following questions.
(a) fill in (A) and (B)

b) Why is the virus called retrovirus?
(c) Can the infected cell survive, while viruses are being replicated and released?

5

(a)

Represent schematically the life cycle of a malarial parasite.

5

(a)