Human Health and Disease — Page 7 | NEET Biology

Q61

Which of the following is a pair of viral diseases?

A Common cold, AIDS

B Dysentery, common cold

C Typhoid, tuberculosis

D Ringworm, AIDS

Correct Answer

Option A

Solution

(a) Common cold and AIDS are both caused by viruses.

Q62

Which one of the following statements is correct with respect to AIDS?

A HIV can be transmitted through eating food together with an infected person

B Drug addicts are least susceptible to HIV infection

C AIDS patients are being fully cured with proper care and nutrition

D The causative HIV retrovirus enters helper T-lymphocytes thus reducing their numbers

Correct Answer

Option D

Solution

(d) HIV destroys helper T lymphocytes (CD4+ cells), reducing their numbers.

Q63

A certain patient is suspected to be suffering from AIDS. Which diagnostic technique will you recommend for its detection?

A ELISA

B MRI

C Ultra sound

D WIDAL

Correct Answer

Option A

Solution

(a) ELISA is the fundamental tool used as an initial screen for HIV detection.

Q64

Passive immunity is induced by injecting

A weakened pathogens

B inactivated toxins

C preformed antibodies

D attenuated microorganisms

Correct Answer

Option C

Solution

(c) Passive immunity involves direct injection of preformed antibodies.

Q65

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 develops when vaccines are administered and the body produces its own antibodies.

Q66

Memory cells are formed from

A T lymphocytes

B B lymphocytes

C Both A and B

D None of the above

Correct Answer

Option C

Solution

(c) Both T and B lymphocytes form memory cells after initial immune response for faster future responses.

Q67

Antibodies in our body are

A proteins

B steroids

C prostaglandins

D carbohydrates

Correct Answer

Option A

Solution

(a) Antibodies are glycoproteins (proteins with carbohydrate moieties) called immunoglobulins.

Q68

Which one of the following immunoglobulins is present in maximum concentration in human body?

A IgA

B IgG

C IgM

D IgE

Correct Answer

Option B

Solution

(b) IgG is the most abundant immunoglobulin in the blood.

Q69

Aflatoxins are produced by

A bacteria

B viruses

C fungi

D protozoa

Correct Answer

Option C

Solution

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

Q70

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).