Respiration in Plants Chapter-Wise Test 10

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which molecule is regenerated at the end of the Krebs cycle?

Citrate
Acetyl-CoA
Oxaloacetate
Pyruvate
3

Oxaloacetate is regenerated at the end of the Krebs cycle to continue the cycle.

Which of the following respiratory substrates has the highest Respiratory Quotient (RQ)?

Glucose
Fats
Proteins
Organic acids
4

Organic acids can have an RQ greater than 1 because they require less oxygen for oxidation compared to CO₂ released.

What is the Respiratory Quotient (RQ) value when fats are used as a respiratory substrate?

1.0
0.9
0.8
Less than 1
4

When fats are used as respiratory substrates, the RQ is less than 1 due to greater oxygen consumption than CO₂ production.

Which of the following is INCORRECT about substrate-level phosphorylation?

It occurs in glycolysis.
It occurs in the Krebs cycle.
It requires the Electron Transport Chain.
It directly produces ATP from ADP.
3

Substrate-level phosphorylation does not require the Electron Transport Chain; it occurs in glycolysis and the Krebs cycle.

Which of the following statements is TRUE about ATP?

It is stored in large quantities in cells
It releases energy when converted to ADP
It is synthesized only in mitochondria
It is not required for active transport
2

ATP releases energy when it is hydrolyzed to ADP, which is used in various cellular processes.

Which of the following correctly represents the overall equation for aerobic respiration?

C₆H₁₂O₆ + O₂ → CO₂ + H₂O + Energy
C₆H₁₂O₆ → Lactic acid + Energy
C₆H₁₂O₆ → Ethanol + CO₂ + Energy
C₆H₁₂O₆ → Acetyl-CoA + CO₂
1

The correct equation for aerobic respiration is: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy.

Which of the following pathways is considered amphibolic?

Glycolysis
Krebs cycle
Fermentation
Electron Transport Chain
2

The Krebs cycle is considered amphibolic because it involves both catabolic (breakdown of molecules) and anabolic (synthesis of precursors) processes.

Which of the following molecules acts as the final electron acceptor in aerobic respiration?

NAD⁺
FADH₂
Oxygen
ATP
3

Oxygen is the final electron acceptor in the Electron Transport Chain, forming water.

What is the function of NADH and FADH₂ in cellular respiration?

Directly produce ATP
Act as final electron acceptors
Donate electrons to the Electron Transport Chain
Break down glucose in glycolysis
3

NADH and FADH₂ donate electrons to the Electron Transport Chain, leading to ATP production through oxidative phosphorylation.

Which of the following statements about oxidative phosphorylation is INCORRECT?

It takes place in the inner mitochondrial membrane.
It generates ATP using a proton gradient.
It occurs before the Krebs cycle.
It requires oxygen as the final electron acceptor.
3

Oxidative phosphorylation occurs after the Krebs cycle, using electrons from NADH and FADH₂.

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