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Science Assertion (A) & Reason (B) MCQ

Forests : Our Lifeline · Gujarat Board (GSEB) STD 7 (GSEB - English Medium). 5 questions.

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Assertion (A) & Reason (B) MCQ

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5 questions · timed · auto-graded

Question 11 Mark
Assertion (A) Forests encourages soil erosion.
Reason (R) The trees in forest hold up the soil together in their roots.
Answer
(D)A is false, but R is true.
Explanation: A can be corrected as Forest prevents soil erosion by holding the soil together in their roots thus, preventing washing away of the soil.
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Question 21 Mark
Assertion (A) Forest helps to purify the air.
Reason (R) They prevent the soil erosion.
Answer
(B) Both A and R are true, but R is not the correct explanation of A.
Explanation: It can be corrected as Forest helps to purify the air by taking in carbon dioxide from the atmosphere and releasing oxygen into it.
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MCQ 31 Mark
Assertion (A) Fungi are decomposers.
Reason (R) They maintain the balance of oxygen and carbon dioxide in the atmosphere.
  • A
    Both A and R are true and R is correct explanation of A
  • B
    Both A and R are true, but R is not the correct explanation of A
  • ✓
    A is true, but R is false
  • D
    A is false, but R is true
Answer
Correct option: C.
A is true, but R is false
(C) A is true, R is false.
Explanation: R can be corrected as Plants maintain the balance of O2 and CO2 in the atmospheric.
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MCQ 41 Mark
Assertion (A) Forests are the dynamic living entities.
Reason (R) Forests provide habitat for wildlife.
  • A
    Both A and R are true and R is the correct explanation of A
  • ✓
    ) 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
Answer
Correct option: B.
) Both A and R are true, but R is not the correct explanation of A
B
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MCQ 51 Mark
Assertion (A) Plants are called as consumers.
Reason (R) They prepare their own food by the process of photosynthesis.
  • 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
  • ✓
    A is false, but R is true
Answer
Correct option: D.
A is false, but R is true
D
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Assertion (A) & Reason (B) MCQ - Science STD 7 Questions - Vidyadip