Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of
Assertion (A).
(c) Assertion (A) is true but Reason (R) is false.
(d) Assertion (A) is false but Reason (R) is true
Q.1. Assertion: Polythene bags and plastic containers are non-biodegradable substances.
Reason: They can be broken down by microorganisms in natural simple harmless substances.
AnswerAnswer: (c) ‘A’ is true but ‘R’ is false.
Q.2. Assertion: The concentration of harmful chemicals is least in human beings.
Reason: Man is at the apex of the food chain.
AnswerAnswer: (d) ‘A’ is false but ‘R’ is true.
Q.3. Assertion: Ozone is formed in upper atmosphere by O2 in presence of UV radiations.
Reason: Ozone depletion will lead to UV rays reaching earth which may cause skin cancer.
AnswerAnswer: (b) Both ‘A’ and ‘R’ are true but ‘R’ is not correct explanation of the assertion.
Q.4. Assertion: Aquarium needs regular cleaning
Reason: There are no microbes to clean water in aquarium, therefore, it needs to be regularly cleaned.
AnswerAnswer: (a) Both ‘A’ and ‘R’ are true and ‘R’ is correct explanation of the assertion.
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