Read the given statements and select the correct option.Statement 1 : A person who has already suffered from diseases like measles, small pox or chicken pox, becomes immune to subsequent attacks of these diseases.Statement 2 : When a particular microbe invades the same person for the second time, the immune system responds rapidly with greater vigour and eliminates the infection more quickly than the first time.A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. C Statement 1 is true but statement 2 is false. D Statement 2 is true but statement 1 is false.
Question
Read the given statements and select the correct option.Statement 1 : A person who has already suffered from diseases like measles, small pox or chicken pox, becomes immune to subsequent attacks of these diseases.Statement 2 : When a particular microbe invades the same person for the second time, the immune system responds rapidly with greater vigour and eliminates the infection more quickly than the first time.A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. C Statement 1 is true but statement 2 is false. D Statement 2 is true but statement 1 is false.
Solution
The correct option is A. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. This is because when a person is infected with diseases like measles, small pox or chicken pox, their immune system develops a memory of the specific pathogens that caused the disease. This is known as acquired immunity. So, if the same pathogens try to invade the body again, the immune system is able to respond more quickly and effectively, preventing the person from getting sick again. This is what is described in statement 2. Therefore, statement 2 is indeed the correct explanation of statement 1.
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