Q20
1 markMCQSection A

Assertion (A): Oxygen is essential for all aerobic forms of life.

Reason (R): Free oxygen atoms combine with molecular oxygen to form ozone.

Life Processes
Respiration

Options

(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.
Official Answer

Oxygen is essential for all aerobic forms of life because it is used to generate energy in the body through the process of respiration. However, the reason given is incorrect as free oxygen atoms do not combine with molecular oxygen to form ozone in the context of aerobic life.

oxygenaerobic liferespiration

Marking Scheme

  • 11 mark

Hint

Recall the importance of oxygen in aerobic life and the process of respiration.

Quick Oral Answer

Oxygen is essential for all aerobic forms of life because it is used to generate energy in the body through the process of respiration.

Analysis & Explanation

The assertion is correct as oxygen is necessary for aerobic life. However, the reason given is incorrect as it does not explain why oxygen is essential for life. The correct explanation is that oxygen is used to generate energy in the body through the process of respiration.

Common Mistakes

  1. 1Confusing the reason with the correct explanation

Interesting Facts

Oxygen is necessary for the survival of most living organisms.

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Frequently Asked Questions

How many marks does this question carry in CBSE Class 10 Science 2024?

This question carries 1 mark in the CBSE Class 10 Science 2024 examination.

Which chapter does this question come from in Science?

This question is from the chapter "Life Processes" in the CBSE Class 10 Science syllabus.

What topic does this question cover in Science?

This question covers the topic "Respiration" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2024 paper?

This is a MCQ question from Section A in the CBSE Class 10 Science 2024 paper.