CBSE Class 12 Biology Human Health and Diseases Diagrams

CBSE Class 12 Biology Human Health and Diseases Diagrams. Please refer to the examination notes which you can use for preparing and revising for exams. These notes will help you to revise the concepts quickly and get good marks.

HUMAN HEALTH AND DISEASES

Important Questions for NCERT Class 12 Biology Human Health and Diseases

Ques. The infective stage of malarial parasite, Plasmodium
that enters human body is
(a) merozoite (b) sporozoite
(c) trophozoite (d) minuta form.

Answer: B

Ques. A bite of tse-tse fly may pass to humans
(a) Leishmania donovani
(b) Trypanosoma gambiense
(c) Entamoeba histolytica
(d) Plasmodium vivax. 

Answer: B

Ques. Malaria fever coincides with liberation of
(a) cryptomerozoties
(b) metacryptomerozoites
(c) merozoites
(d) trophozoites. 

Answer: B

Ques. The vector for sleeping sickness is
(a) housefly (b) tse-tse fly
(c) sandfly (d) fruit fly. 

Answer: B

Ques. The causal organism for African sleeping sickness is
(a) Trypanosoma cruzi (b) T. rhodesiense
(c) T. tangela (d) T. gambiense. 

Answer: D

Ques. Identify the wrong statement with reference to immunity.
(a) When exposed to antigen (living or dead) antibodies are produced in the host’s body. It is called “Active immunity”.
(b) When ready-made antibodies are directly given, it is called “Passive immunity”.
(c) Active immunity is quick and gives full response.
(d) Fetus receives some antibodies from mother, it is an example for passive immunity.

Answer: C

Ques. Which of the following immune responses is responsible for rejection of kidney graft?
(a) Cell-mediated immune response
(b) Auto-immune response
(c) Humoral immune response
(d) Inflammatory immune response 

Answer: A

Ques. Colostrum, the yellowish fluid, secreted by mother during the initial days of lactation is very essential to impart immunity to the new born infants because it contains
(a) immunoglobulin A (b) natural killer cells
(c) monocytes (d) macrophages.

Answer: A

Ques. Which of the following is not an autoimmune disease?
(a) Psoriasis
(b) Rheumatoid arthritis
(c) Alzheimer’s disease
(d) Vitiligo 

Answer: C

Ques. Transplantation of tissues/organs fails often due to non-acceptance by the patient’s body. Which type of immune response is responsible for such rejections?
(a) Cell-mediated immune response
(b) Hormonal immune response
(c) Physiological immune response
(d) Autoimmune response

Answer: A

Ques. MALT constitutes about percent of the lymphoid tissue in human body.
(a) 20% (b) 70%
(c) 10% (d) 50%

Answer: D

Ques. Antivenom injection contains preformed antibodies while polio drops that are administered into the body contain
(a) gamma globulin (b) attenuated pathogens
(c) activated pathogens (d) harvested antibodies.

Answer: B

Ques. In higher vertebrates, the immune system can distinguish self-cells and non-self. If this property is lost due to genetic abnormality and it attacks selfcells, then it leads to
(a) autoimmune disease (b) active immunity
(c) allergic response (d) graft rejection.

Answer: A

Ques. If you suspect major deficiency of antibodies in a person, to which of the following would you look for confirmatory evidence?
(a) Haemocytes
(b) Serum globulins
(c) Fibrinogen in plasma
(d) Serum albumins 

Answer: B

Ques. Which of the following immunoglobulins does constitute the largest percentage in human milk?
(a) IgA (b) IgG
(c) IgD (d) IgM 

Answer: A

Ques. Grafted kidney may be rejected in a patient due to
(a) passive immune response
(b) innate immune response
(c) humoral immune response
(d) cell-mediated immune response.

Answer: D

Ques. 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. 

Answer: B

Ques. Lysozyme that is present in perspiration, saliva and tears, destroys
(a) certain types of bacteria
(b) all viruses
(c) most virus-infected cells
(d) certain fungi. 

Answer: A

Ques. Antibodies in our body are complex
(a) glycoproteins (b) lipoproteins
(c) steroids (d) prostaglandins.

Answer: A

Ques. 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. 

Answer: D

Ques. Short-lived immunity acquired from mother to fetus across placenta or through mother’s milk to the infant is categorised as
(a) active immunity
(b) passive immunity
(c) cellular immunity
(d) innate non-specific immunity. 

Answer: B

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