AIIMS Zoology Human Health And Diseases Class 12 Questions

Acquired Immunity mediated by which of the following

Choose the correct statement

The assertion statement is true that ‘small particulate matter of size 2.5μm or less is harmful for health. The reason statement is also true that ‘nasal cavity and throat filters most of the large particles’, but it is not the correct explanation for assertion.

Activity of phagocytosis occurs through

The statement given in the assertion is known to be true as deficiency of iron causes abnormality in the menstrual cycle. The statement given in the reason is known to be false because the levels of estrogen and progesterone do not become low.

The scurvy is not caused by the deficiency of an element, as it is caused by the deficiency of vitamin C. Also, the statement given in the reason that, ‘daily requirement of ascorbic acid is 5 mg/day is incorrect. It is 90 mg in adult males and 75 mg in adult females.

Short-lived immunity acquired from mother to foetus placenta or through mother’s milk to the infant is categorized as

Assertion: Filarial worm is transmitted to humans by Culex mosquito. Reason: Culex prefers to breed in fresh water.

Assertion: AIDS is caused by the HIV, a retrovirus. Reason: Retroviruses have RNA genome.

Assertion : Sporozoites of malarial parasite enter in the human body due to biting of freshly born female Anopheles mosquito, whose mother was a carrier of malarial parasite. Reason : Male and female gametocytes of malarial parasites are formed in the human intestine.

Which one is correct?

CD^{-4} receptor is associated with

Assertion: Interferons are antiviral proteins. Reason: Interferons are secreted by virus infected cells.

Assertion: All pathogens are parasites but all parasites are not pathogens. Reason: Majority of the parasites confer benefits to the host.

Intermediate host is absent in the infection of

Cytokines that provide non specific immunity against virus are

Assertion (A) : Antigen can be easily recognized because it has antigenic determinants. Reason (R) : The recognition ability is innate.

Assertion: A person who has received a cut and is bleeding needs to be given anti-tetanus treatment. Reason: Anti-tetanus injection provides immunity by producing antibodies for tetanus.

Assertion: Cancer cells are virtually immortal until the body in which they reside dies. Reason: Cancer is caused by damage to genes regulating the cell division cycle.

Assertion: LSD and marijuana are clinically used as analgesics. Reason: Both these drugs suppress brain function.

An insect bite may result in inflammation of that spot. This is triggered by the alarm chemicals such as:

Formation of non-functional methaemoglobin causes blue-baby syndrome. This is due to:

A young drug addict used to show symptoms of depressed brain activity; feeling of calmness, relaxation and drowsiness. Possibly he was taking:

Antigen binding site in an antibody is found between:

Assertion : Interferons are a type of antibodies produced by body cells infected by bacteria. Reason : Interferons stimulate inflammation at the site of injury.

Assertion : Organ transplantation patients are given immunosuppressive drugs. Reason : Transplanted tissue has antigens which stimulate the specific immune response of the recipient.

Assertion : Persons suffering from haemophilia fail to produce blood clotting factor VIII. Reason : Prothrombin producing platelets in such persons are found in very low concentration.

Which one of the following is a matching pair of a drug and its category?

Electron beam therapy is a kind of radiation therapy to treat

The treatment of snake-bite by antivenine is an example of

Assertion : Tapeworm, roundworm and pinworm are endoparasites of human intestine. Reason : Improperly cooked food is the source of all intestinal infections.

Which of the following displays immune tolerance?

Lysis of foreign cell is mediated through

In Entamoeba histolytica, the presence of chromatid bodies is characteristic of

Adults of Wuchereria bancrofti attacks

The sites of the first, second and third moulting of the Ascaris larva are

Cocaine is a stimulant, which may cause addiction. It is an alkaloid obtained from:

Viral diseases have no cure because

Which of the following organism is found in lymph nodes?

Malignant tertian malaria is caused by

Assertion: Cancer is contagious and cells can spread from one person to other. Reason: Cancerous cells are highly dedifferentiated cells.