Respiration in Plants Chapter-Wise Test 11

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which enzyme catalyzes the conversion of pyruvate to ethanol in anaerobic respiration?

Lactate dehydrogenase
Pyruvate decarboxylase
Hexokinase
Aldolase
2

Pyruvate decarboxylase catalyzes the conversion of pyruvate into ethanol during alcoholic fermentation.

Which of the following is INCORRECT about aerobic respiration?

It requires oxygen.
It occurs only in prokaryotic cells.
It involves glycolysis, the Krebs cycle, and the Electron Transport Chain.
It produces more ATP than anaerobic respiration.
2

Aerobic respiration occurs in both prokaryotic and eukaryotic cells.

Which compound is formed when pyruvate undergoes alcoholic fermentation?

Lactic acid
Ethanol
Acetyl-CoA
Oxaloacetate
2

During alcoholic fermentation, pyruvate is converted into ethanol and carbon dioxide.

Which of the following is INCORRECT regarding the Krebs cycle?

It occurs in the mitochondrial matrix.
It produces NADH and FADH₂.
It directly uses glucose as a substrate.
It releases carbon dioxide as a byproduct.
3

The Krebs cycle does not use glucose directly; glucose is first broken down into pyruvate, which is then converted into Acetyl-CoA.

Which coenzyme is reduced during glycolysis and Krebs cycle?

NADP⁺
NAD⁺
Coenzyme A
FAD
2

NAD⁺ is reduced to NADH during glycolysis and the Krebs cycle, playing a crucial role in cellular respiration.

Which of the following statements about ATP synthase is INCORRECT?

It is located in the inner mitochondrial membrane.
It synthesizes ATP using the proton gradient.
It requires the presence of NADH.
It plays a role in oxidative phosphorylation.
3

ATP synthase does not require NADH directly; it uses the proton gradient created by the Electron Transport Chain.

Which of the following is NOT a reason why plants do not require a specialized respiratory system?

They have a lower energy demand
Gaseous exchange occurs through stomata and lenticels
They do not require oxygen for respiration
Each plant cell carries out its own respiration
3

Plants require oxygen for respiration, but they do not have specialized respiratory organs due to lower energy needs and efficient gas diffusion.

Which compound serves as a common intermediate between carbohydrate, lipid, and protein metabolism?

Glucose
Acetyl-CoA
Pyruvic acid
Oxaloacetic acid
2

Acetyl-CoA acts as a central metabolic intermediate, linking the breakdown of carbohydrates, lipids, and proteins.

Which of the following statements about fermentation is INCORRECT?

It occurs in the absence of oxygen.
It takes place in the mitochondria.
It produces ethanol or lactic acid.
It generates much less ATP than aerobic respiration.
2

Fermentation occurs in the cytoplasm, not in the mitochondria.

Which of the following statements about oxidative phosphorylation is CORRECT?

It occurs in the inner mitochondrial membrane.
It occurs in the cytoplasm.
It does not require oxygen.
It is part of glycolysis.
1

Oxidative phosphorylation takes place in the inner mitochondrial membrane and requires oxygen.

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