10 Question MCQ (including Assertion)

Question 1 of 10

Assertion (A): The concentration of harmful chemicals is more in human beings.
Reason (R): Man is at the apex of the food chain.

A Both A and R are true, and R is the correct explanation of A. B Both A and R are true, but R is not the correct explanation of A. C A is true, but R is false. D A is false, but R is true.

Select one option. Answers are shown after the test.

Question 2 of 10

Assertion: Greater number of individuals are present in lower trophic levels.
Reason: The flow of energy is unidirectional.

A Both A and R are true, and R is the correct explanation of A. B Both A and R are true, but R is not the correct explanation of A. C A is true, but R is false. D A is false, but R is true.

Select one option. Answers are shown after the test.

Question 3 of 10

Assertion (A): Ozone is both beneficial and damaging.
Reason (R): Stop the release of chlorofluorocarbons to protect the ozone.

A Both A and R are true, and R is the correct explanation of A. B Both A and R are true, but R is not the correct explanation of A. C A is true, but R is false. D A is false, but R is true.

Select one option. Answers are shown after the test.

Question 4 of 10

Assertion: Food chain is responsible for the entry of harmful chemicals in our bodies.
Reason: The length and complexity of food chains vary greatly.

A Both A and R are true, and R is the correct explanation of A. B Both A and R are true, but R is not the correct explanation of A. C A is true, but R is false. D A is false, but R is true.

Select one option. Answers are shown after the test.

Question 5 of 10

Assertion (A): Decomposers keep the environment clean.
Reason (R): They recycle matter by breaking down the organic remains and waste products of plants and animals.

A Both A and R are true, and R is the correct explanation of A. B Both A and R are true, but R is not the correct explanation of A. C A is true, but R is false. D A is false, but R is true.

Select one option. Answers are shown after the test.

Question 6 of 10

Assertion (A): CFCs deplete the ozone layer.
Reason (R): CFCs are used as refrigerants and in fire extinguishers.

A Both A and R are true, and R is the correct explanation of A. B Both A and R are true, but R is not the correct explanation of A. C A is true, but R is false. D A is false, but R is true.

Select one option. Answers are shown after the test.

Question 7 of 10

NCERT Exemplar

In an ecosystem, the \(10 \%\) of energy available for transfer from one trophic level to the next is in the form of:

A heat energy. B light energy. C chemical energy. D mechanical energy.

Select one option. Answers are shown after the test.

Question 8 of 10

NCERT Exemplar

Select the mismatched pair in the following and correct it.

A Bio-magnification - Accumulation of chemicals at the successive trophic levels of a food chain B Ecosystem - Biotic components of environment C Aquarium - A man-made ecosystem D Parasites - Organisms which obtain food from other living organisms

Select one option. Answers are shown after the test.

Question 9 of 10

NCERT Exemplar

Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the \(\_\_\_\_\).

A food web. B ecological pyramid. C ecosystem. D food chain.

Select one option. Answers are shown after the test.

Question 10 of 10

NCERT Exemplar

Excessive exposure of humans to UV-rays results in
(i) damage to immune system.
(ii) damage to lungs.
(iii) skin cancer.
(iv) peptic ulcers.

A (i) and (ii) B (ii) and (iv) C (i) and (iii) D (iii) and (iv)

Select one option. Answers are shown after the test.

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10 Question MCQ (including Assertion)