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CBSE 12th Standard Biology Subject Human Health and Disease Ncert Exemplar 1 Marks Questions 2021

Published on: 25/05/2021

QB365 Provides the updated NCERT Examplar Questions for Class 12 Biology, and also provide the detail solution for each and every ncert examplar questions , QB365 will give all kind of study materials will help to get more marks

Download CBSE Class 12th Standard CBSE Biology question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Biology

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Std: 12th Standard CBSE - Biology

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Questions:

1 Marks

5 x 1 = 5

Indiscriminate diagnostic practices using X - rays, etc., should be avoided. Give one reason.

Name the toxin responsible for the appearance of symptoms of malaria in human. Why do these symptoms occurs periodically?

Certain pathogens are tissue/organ specific.Justify the statement with suitable example.

What would happen to immune system, if thymus gland is removed from the body of a person?

Which protein occurs in the stratum corneum of epidermis?

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Answers Key:

1 Marks

5 x 1 = 5

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Indiscriminate diagnostic practices using X - rays should be avoided because there are several potential risks from exposure to ionising radiations, such as cancer can be developed in later stages of life, tissues can also get affected such as in cataract, hair loss, etc.

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The toxin responsible for symptoms of malaria is haemozoin. It is released when RBCs get ruptured due to erythrocytic schizogony of Plasmodium that takes place every 48 hrs.

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Certain pathogens are tissue/organ specific as they are adapted to overcome the resistance mechanisms of those tissues and organs, e.g. the pathogens that enter the gut must know a way surviving in the stomach at low p^H and must be resistant to various digestive enzymes.

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If thymus gland is removed from the body of a person, his immune system will become weak. As a result the person's body becomes prone to infectious diseases.