L.S.D, morphine and bhang are respectively obtained from

1

(a)

Claviceps, Papaver and Cannabis

(b)

Claviceps, Cannabis and Rauwolfia

(c)

Cannabis, Claviceps and Fuscarium

(d)

Claviceps, Rauwolfia and Papaver

The stimulant present in tea, cocoa and cola drinks is

1

(a)

Cocaine

(b)

Tannin

(c)

Astringent

(d)

Caffeine

Which of the following is involved in defence mechanism of the body?

1

(a)

Lymphocytes

(b)

Neutrophils

(c)

Macrophages

(d)

All of these

T-lymphocytes first mature in

1

(a)

Thymus

(b)

Pancreas

(c)

Liver

(d)

Spleen

Marijuana and charas are

1

(a)

Stimulant

(b)

Hallucinogens

(c)

Depressant

(d)

Sedative

What is it that prevents a child to suffer from a disease he/she is vaccinated against?Give one reason.

1

(a)

1. His body develops antibodies,that circulate in the body fluids and neutralise the pathogenic agent during subsequent encounters.
2. Memory B cells and memory T cells are retained inthe system.

Give the scientific name of the pathogen causing malignant malaria in humans.

1

(a)

Plasmodium falciparum

List three fungal genera which cause ringworm?

1

(a)

(i) Microsporum
(ii) Trichophyton
(iii) Epidermophyton.

Define autoimmunity.

1

(a)

It is an abnormally which sometimes occur in the immune system and instead of destroying foreign molecules,it attacks body's own cells.

Name and explain the type of immunity that is provided by injecting microbes deliberately during immunisation into the human body.

2

(a)

Name the two special types of lymphocytes in humans.How do they differ in their roles in immune response?

2

(a)

Name the plant source of ganja.How does it affect the body of the abuser?

2

(a)

Why do sports person often fall a victim to cocaine addiction?

2

(a)

Name the pathogen that causes amoebiasis in humans.Give the symptoms and the mode of transmission of the disease.

3

(a)

Trace the life cycle of malarial parasite in the human body,when bitten by an infected female Anopheles.

3

(a)

A person is suffering from Ascariasis Mention the pathogen causing the disease and an organ of the body affected,three symptoms and one mode of transmission of the disease.

3

(a)

Think what two measures should be taken for prevention and control of alcohol and drug abuse among adolescents

3

(a)

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

5

(a)

Describe stem cells, write their sources and uses.

5

(a)

Represent schematically the life cycle of a malarial parasite.

5

(a)