Biology
Assertion (A): Immunity is the resistance to the onset of a disease after infection by harmful germs.
Reason (R): A body's immunity is maintained by two proteinaceous substances — antigens and antiseptics.
- A is True and R is False.
- A is False and R is True.
- Both A and R are True.
- Both A and R are False.
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Answer
A is True and R is False.
Reason — Immunity refers to the body’s ability to resist or fight off infections caused by harmful pathogens. It can be natural or acquired and may result from previous infection or vaccination.
Antigens are foreign substances (such as bacteria or viruses) that trigger the immune response. Antiseptics are chemical substances used externally to kill germs on skin or surfaces, they are not part of the immune system. The proteinaceous substances involved in immunity are antibodies, not antigens or antiseptics.
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Related Questions
Antibody is a blood serum protein produced in response to:
- Antitoxins
- Antibiotics
- Antigens
- Antiseptics
A biology teacher asked her students to give two examples of antiseptics, which can be used to kill germs.
Prerna said: Boric acid and 40% Formalin.
Shreya said: Benzoic acid and Bordeaux mixture.
Rahul said: Carbolic acid and Boric acid.
Rishi said: Mercurochrome and Benzoic acid.
Who were correct ?
- Prerna and Shreya
- Shreya and Rahul
- Rahul and Rishi
- Rishi and Prerna
Assertion (A): Antigens are produced by a type of specialised lymphocytes on exposure to antibodies.
Reason (R): Antibodies recognise a particular antigen and binds to it rendering it harmless. Thus antibodies protect us from disease-causing germs.
- A is True and R is False.
- A is False and R is True.
- Both A and R are True.
- Both A and R are False.
Assertion (A): The vaccine for tuberculosis is made up of living, fully poisonous germs.
Reason (R): Living, weakened germs in the vaccine were not satisfactory to prevent the disease.
- A is True and R is False.
- A is False and R is True.
- Both A and R are True.
- Both A and R are False.