Assertion and Reason Questions for Class 10 Science Chapter 15 Our Environment

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Assertion and Reason Questions for Class 10 Science Chapter 15 Our Environment

Following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:

(a) Both ‘A’ and ‘R’ are true and ‘R’ is correct explanation of the Assertion.
(b) Both ‘A’ and ‘R’ are true but ‘R’ is not correct explanation of the Assertion.
(c) ‘A’ is true but ‘R’ is false.
(d) ‘A’ is false but ‘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.

Answer Answer: (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.

Answer Answer: (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.

Answer Answer: (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.

Answer Answer: (a) Both ‘A’ and ‘R’ are true and ‘R’ is correct explanation of the assertion.

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