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Science Assertion - Reasoning (1 Marks)

MODEL PAPER - 1 [2026] · CBSE STD 10 (CBSE - English Medium). 2 questions.

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Assertion - Reasoning (1 Marks)

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2 questions · timed · auto-graded

Question 11 Mark
Assertion (A): A food chain can have maximum of three trophic levels.
Reason (R): Energy available at each trophic level keeps on decreasing as we move higher up the food chain.
Answer
(D) A is false but R is true.
Explanation: A food chain can have a maximum of five to six trophic levels, this is because a lot of energy is lost as heat at each trophic level on account of metabolism. So, a small amount of energy becomes available to the next trophic level. This limits the number of trophic level in a food chain.
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Question 21 Mark
Assertion (A) : Non flowering plants cannot reproduce sexually.
Reason (R): Flower is only reproductive part of the plant that can produce gametes.
Answer
(A) Both A and R are true and R is the correct explanation of A .
Explanation:
Gametes are mandatory for sexual reproduction. Though plants can reproduce through other parts like stem and roots (vegetative reproduction), but they cannot reproduce sexually in absence of flowers. Thus both assertion and reason are true and reason is the correct explanation of the assertion.
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Assertion - Reasoning (1 Marks) - Science STD 10 Questions - Vidyadip