Human Health and Disease — Page 12 | NEET Biology

Q111

Aflatoxins are produced by

A bacteria

B viruses

C fungi

D protozoa

Correct Answer

Option C

Solution

(c) Aflatoxins are toxic metabolites produced by Aspergillus flavus (fungus).

Q112

Cannabis sativa yields

A Cocaine

B Morphine

C Marijuana

D LSD

Correct Answer

Option C

Solution

(c) Cannabis sativa yields marijuana (also hashish and charas from resin).

Q113

Nicotine is present in

A Tobacco

B Opium

C Cannabis

D Cocaine

Correct Answer

Option A

Solution

(a) Nicotine is the addictive substance found in tobacco (Nicotiana tabacum).

Q114

The term vaccine was coined by

A Jenner

B Pasteur

C Koch

D Fleming

Correct Answer

Option B

Solution

(b) Louis Pasteur coined the term vaccine in honour of Jenner's cowpox work.

Q115

Which of the following is not an autoimmune disease?

A Rheumatoid arthritis

B Type 1 diabetes

C Multiple sclerosis

D AIDS

Correct Answer

Option D

Solution

(d) AIDS is caused by HIV (retrovirus), not by autoimmune response.

Q116

Haemozoin is

A a toxin released by malarial parasite

B a by-product of haemoglobin digestion by malarial parasite

C responsible for fever in malaria

D both B and C

Correct Answer

Option D

Solution

(d) Haemozoin is a by-product of Hb digestion by Plasmodium and causes recurring fever when released.

Q117

Wuchereria bancrofti causes

A Filariasis

B Elephantiasis

C Both A and B

D Ascariasis

Correct Answer

Option C

Solution

(c) Wuchereria bancrofti causes both filariasis and elephantiasis (lymphatic filariasis).

Q118

Colostrum is important for newly born infant due to presence of

A IgA antibodies

B IgG antibodies

C IgM antibodies

D IgE antibodies

Correct Answer

Option A

Solution

(a) Colostrum (first milk) is rich in IgA antibodies providing passive immunity to the newborn.

Q119

Active immunity develops when

A antibodies are directly injected

B vaccines are administered

C mother passes antibodies to foetus

D antibodies are passed through colostrum

Correct Answer

Option B

Solution

(b) Active immunity: body produces its own antibodies in response to vaccines (antigen exposure).

Q120

To which type of barriers under innate immunity do the saliva in the mouth and tears from the eyes belong?

A Cytokine barriers

B Cellular barriers

C Physiological barriers

D Physical barriers

Correct Answer

Option C

Solution

(c) Saliva and tears are physiological barriers of innate immunity.