Assertion(A): Energy released by oxidation in respiration is not used directly but is used to synthesize ATP.
Reason(R): ATP can be broken down whenever energy is required by cells.
Choices for Assertions and reasons:
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.

Subtopic:  Respiratory Quotient |
 79%
From NCERT
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Assertion(A): Plants have systems in place that ensure the availability of O2.
Reason(R): Plants require O2 for respiration to occur and they also give out CO2.
Choices for Assertions and reasons:
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic:  Respiratory Quotient |
 50%
From NCERT
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Assertion (A): In the respiratory pathway, different substrates would enter if they were to be respired and used to derive energy.
Reason (R): Fatty acids would be broken down to acetyl CoA before entering the respiratory pathway.
Choices for Assertions and reasons:
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True, but (R) is not the correct explanation of (A).
3. (A) is True, but (R) is False.
4. (A) is False, but (R) is True.
Subtopic:  Amphibolic Nature of Respiration |
 65%
From NCERT
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Assertion (A): Respiration is an amphibolic process.
Reason (R): The respiratory pathway shows both catabolism and anabolism during breakdown and synthesis of respiratory substrates.
Choices for Assertions and reasons:
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. (A) is False but (R) is True.
Subtopic:  Amphibolic Nature of Respiration |
 91%
From NCERT
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Assertion (A): Availability of oxygen is not a problem in all plant cells.
Reason (R): All photosynthetic cells release O2 within the cell.

1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. (A) is False but (R) is True.
Subtopic:  Introduction |
From NCERT
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Assertion(A): The presence of oxygen in aerobic respiration is vital.
Reason(R): It derives the whole process by removing H from the system.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic:  ETS |
 85%
From NCERT
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Assertion(A): The respiratory process has traditionally been considered a catabolic process.
Reason(R): Respiration involves the breakdown of substrates.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic:  THE RESPIRATORY BALANCE SHEET |
 80%
From NCERT
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In aerobic oxidative phosphorylation, the final electron acceptor of the electron transport chain is:
1. NAD+
2. oxygen
3. pyruvate
4. water
Subtopic:  ETS |
 86%
From NCERT
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What is the number of ATP molecules produced by substrate-level phosphorylation from the complete breakdown of a single molecule of glucose in the presence of oxygen?
1. 2
2. 3
3. 4
4. 6
Subtopic:  Aerobic Respiration | Kreb's Cycle |
From NCERT
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During glycolysis, an ATP molecule is synthesised during the conversion of:
I: BPGA to 3-phosphoglyceric acid (PGA)
II: PEP to pyruvic acid
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic:  Glycolysis |
 80%
From NCERT
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