Class 12th Biology – 8 Health and Disease MCQs

Pick up the correct pair

Correct! Wrong!

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Plague is transmitted by rat fleas (Xenopsylla)

What is true about T-lymphocytes in mammals?

Correct! Wrong!

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

The thymus gland is located

Correct! Wrong!

The thymus gland is located near the heart beneath the breast bone.

Antibodies are the macromolecule of

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Antibodies are the macromolecules of protein.

Radiations can destroy cancer cells because

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In radiotherapy, genes of the cells are damaged by radiations so cells stop dividing.

Which one of the following acts as a physiological barrier to the entry of micro-organisms in human body?

Correct! Wrong!

Skin has a metabolic function to prevent non-resident bacteria from developing.

All are secondary lymphoid organs except

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Thymus is a primary lymphoid organ where immature lymphocytes differentiate into antigen sensitive lymphocytes.

HIV virus has

Correct! Wrong!

The HIV virus is a retrovirus having a protein coat and a single stranded RNA.

The cells which produce antibodies are

Correct! Wrong!

B lymphocytes recognise the antigen with the help of the antibody on its surface and present the processed antigen on the B cell. Then T-lymphocytes recognise the processed anitgen on B cell and activate B-Lymphocytes to produce plasma cells that generate antibodies. T-lymphocytes only activate B cells. Monocytes and neutrophils are not involved in the production of antibodies.

Cancer is often the result of activation of which genes?

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Cellular oncogenes when activated lead to transformation of normal cells into cancerous cells.

Sudden cessation of heroin can cause

Correct! Wrong!

The body gets conditioned to the use of drugs and hence in its absence will show withdrawal symptoms like anxiety,nausea and sweating.

Colostrum is rich in

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Colostrum is the yellowish fluid secreted by the mother in the intial days of lactation and it is rich in IgA.

Which one of the following is an effective painkiller?

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Morphine is a sedative and a painkiller, useful for patients who have undergone surgeries.

Anamnestic response is

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Anamnestic response is a name given to secondary response which occurs due to secondary exposure to a pathogen.

Widal test is used for confirmation of which of these diseases?

Correct! Wrong!

Widal test is a confirmatory test for typhoid.

Mark the correct statement in the followings.

Correct! Wrong!

CMI causes rejection of graft.

Common cold is not cured by antibiotics because it is

Correct! Wrong!

Common cold is due to rhinovirus. Antibiotics do not kill viruses as they are directed against bacteria, fungi etc.

The organism which causes elephantiasis is a

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The causal organism for elephantiasis is Wuchereria, which is a helminthes/nematoda. It is also called filarial worm.

Which of the following pairs is not correctly matched?

Correct! Wrong!

Tetanus is caused by Clostridium tetani, while plague is caused by Pasteurella pestis.

With addiction to a substance, the tolerance level of receptors

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With repeated exposure to addictive substances the tolerance level of body receptors increases. Consequently the receptors respond to higher doses of the substance leading to greater intake and addiction.

Shivering in malaria is caused due to

Correct! Wrong!

The symptoms of malaria are shown because of release of a toxin haemozoin. This is released when the RBC is ruptured.

Hepatitis B vaccine are expressed by rDNA technology in

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Hepatitis vaccine contain hepatitis B surface antigens and is cloned (rDNA technology) and expressed in yeast cells which is a fungus.

Which of the following is not the characteristic of a cancerous cell?

Correct! Wrong!

Normal cells have the property of contact inhibition due to which cells stop dividing when they come in contact with one another. Cancer cells appears to have lost this property, as a result they show uncontrolled division.

To complete its lifecycle, the malarial parasite requires

Correct! Wrong!

For completing its lifecycle the malarial parasite requires two hosts-man and female Anopheles mosquito and the primary host- female Anopheles mosquito is also called vector.The mosquito thus acts as both the host and the vector.

Vaccines help in producing

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Vaccines help in producing memory cells in the body which can be stored and provide immunity when the body comes in contact with the pathogen again.

Which one of the following is not correctly matched?

Correct! Wrong!

Malaria is a vector borne disease that spreads by biting of the female Anopheles mosquito.

Cancerous cells can easily be destroyed by radiations due to

Correct! Wrong!

Cancerous cells can easily be destroyed by radiations due to rapid cell division.

Which of the following is due to allergic reaction?

Correct! Wrong!

Hay fever is caused due to pollen grains and is an allergic reaction . Rheumatoid arthritis is an example of an autoimmune disease, cancer is a metabolic disorder while hepatitis is a microbial disease.

What enters the mosquito when it bites an infected person?

Correct! Wrong!

The female mosquito takes up gametocytes when it bites an infected person.

Class 12th Biology - 8 Health and Disease MCQs
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