Human Health and Disease — Page 13 | NEET Biology

Q121

The use of anti-histamines and steroids gives a quick relief from

A nausea

B cough

C headache

D allergy

Correct Answer

Option D

Solution

(d) Antihistamines block histamine action; steroids suppress immune response — both relieve allergy.

Q122

If you suspect major deficiency of antibodies in a person, to which of the following would you look for confirmatory evidence?

A Serum albumins

B Haemocytes

C Serum globulins

D Fibrinogen in plasma

Correct Answer

Option C

Solution

(c) Serum globulins contain antibodies (immunoglobulins); their deficiency confirms antibody deficiency.

Q123

What is true about T-lymphocytes in mammals?

A These are produced in the thyroid

B There are three main types - cytotoxic T-cells, helper T-cells and suppressor T-cells

C These originate in lymphoid tissues

D They scavenge damaged cells and cellular debris

Correct Answer

Option C

Solution

(c) T-lymphocytes differentiate in the thymus but originate in lymphoid tissues.

Q124

Damage to thymus in a child may lead to:

A a reduction in haemoglobin content of blood

B a reduction in stem cell production

C loss of antibody mediated immunity

D loss of cell mediated immunity

Correct Answer

Option D

Solution

(d) Thymus produces T-lymphocytes responsible for cell-mediated immunity.

Q125

The cell in the human body invaded by HIV is

A T-helper cell

B Erythrocyte

C B-cell

D Macrophage

Correct Answer

Option A

Solution

(a) HIV primarily invades T-helper cells (CD4+ T-lymphocytes), suppressing the immune system.

Q126

Antibodies in our body are complex

A steroids

B prostaglandins

C glycoproteins

D lipoproteins

Correct Answer

Option C

Solution

(c) Antibodies are glycoproteins (immunoglobulins) produced by B-cells.

Q127

Increased asthmatic attacks in certain seasons are related to

A eating fruits preserved in tin containers

B inhalation of seasonal pollen

C low temperature

D hot and humid environment.

Correct Answer

Option B

Solution

(b) Seasonal pollen causes severe allergies and bronchial afflictions (asthma).

Q128

Cells involved in immune mechanism are

A Erythrocytes

B Lymphocytes

C Eosinophils

D Thrombocytes

Correct Answer

Option B

Solution

(b) Lymphocytes are the key cells of the specific immune system.

Q129

Obstacle to large scale transplantation of organs is

A insufficiency of organ donors

B immunological rejection of foreign bodies

C religious or ethnic considerations

D lack of effective surgical techniques

Correct Answer

Option B

Solution

(b) The major obstacle to organ transplantation is immunological rejection by the recipient body.

Q130

Vaccines are biological preparations that stimulate the immune system to recognize and fight pathogens by providing

A treated bacteria or viruses or one of their proteins

B MHC (major histocompatibility complex) proteins

C curative medications

D monoclonal antibodies

Correct Answer

Option A

Solution

(a) Vaccines contain dead, attenuated or antigenic components of a pathogen to stimulate immunity.