Human Health and Disease — Page 8 | NEET Biology

Q71

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).

Q72

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 Edward Jenner's work with cowpox.

Q73

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 (a retrovirus), not by autoimmune response.

Q74

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 haemoglobin digestion by Plasmodium and causes fever when released.

Q75

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).

Q76

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) contains IgA antibodies that provide passive immunity to the newborn.

Q77

Which of the following about AIDS is incorrect?

A AIDS is caused by HIV which is a retrovirus

B AIDS affects the immune system

C AIDS can be transmitted through sexual contact only

D AIDS has no confirmed cure till date

Correct Answer

Option C

Solution

(c) AIDS can also be transmitted through blood transfusion, sharing needles, and mother to child.

Q78

Which of the following diseases is caused by a bacterium?

A Hepatitis B

B Malaria

C Tuberculosis

D Rabies

Correct Answer

Option C

Solution

(c) Tuberculosis is caused by Mycobacterium tuberculosis, a bacterium.

Q79

Interferons are synthesised in response to

A Bacteria

B Mycoplasma

C Viruses

D Fungi

Correct Answer

Option C

Solution

(c) Interferons are proteins synthesized by virus-infected cells to protect neighbouring cells.

Q80

The use of antihistamine and steroids give quick relief from allergy because they

A deactivate the pathogen causing allergy

B enhance production of antibodies

C suppress the immune system

D stimulate production of antigen

Correct Answer

Option C

Solution

(c) Antihistamines and steroids suppress the immune system, reducing allergy symptoms.