Human Health and Disease — Page 3 | NEET Biology

Q21

Lymph nodes are sites where

A RBCs are produced

B T lymphocytes mature

C antigen-antibody reactions occur

D B lymphocytes mature

Correct Answer

Option C

Solution

(c) Lymph nodes are sites of antigen-antibody reactions during immune response.

Q22

Which cells are attacked by HIV?

A T helper lymphocytes

B B lymphocytes

C Thrombocytes

D Erythrocytes

Correct Answer

Option A

Solution

(a) HIV attacks T helper (CD4+) lymphocytes.

Q23

Which one of the following is caused by Plasmodium vivax?

A sleeping sickness

B kala azar

C filariasis

D malaria

Correct Answer

Option D

Solution

(d) Plasmodium vivax causes benign tertian malaria.

Q24

Which one of the following diseases is now considered nearly eradicated from India?

A Plague

B Kala azar

C Small pox

D Poliomyelitis

Correct Answer

Option C

Solution

(c) Small pox (caused by Variola virus) has been eradicated worldwide.

Q25

Typhoid fever is caused by

A Salmonella

B Shigella

C Escherichia

D Giardia

Correct Answer

Option A

Solution

(a) Typhoid fever is caused by Salmonella typhi.

Q26

Common cold is not cured by antibiotics because it is

A caused by a virus

B caused by a Gram-positive bacterium

C caused by a Gram-negative bacterium

D not an infectious disease

Correct Answer

Option A

Solution

(a) Common cold is due to rhinovirus; antibiotics do not kill viruses.

Q27

In which one of the following diseases both the example diseases are caused by viruses?

A Tetanus and typhoid

B Whooping cough and sleeping sickness

C Syphilis and AIDS

D Measles and rabies

Correct Answer

Option D

Solution

(d) Both measles and rabies are viral diseases.

Q28

Which part of poppy plant is used to obtain the drug Smack?

A Flowers

B Latex

C Leaves

D Roots

Correct Answer

Option B

Solution

(b) Heroin (Brown sugar/Smack) is obtained from the latex of unripe capsules of Papaver somniferum.

Q29

Drug called Heroin is synthesised by:

A methylation of morphine

B acetylation of morphine

C glycosylation of morphine

D nitration of morphine

Correct Answer

Option B

Solution

(b) Heroin (diacetylmorphine) is synthesized by acetylation of morphine.

Q30

Coca alkaloid or cocaine is obtained from:

A Datura

B Papaver somniferum

C Atropa belladonna

D Erythroxylum coca

Correct Answer

Option D

Solution

(d) Cocaine is obtained from Erythroxylum coca, native to South America.