Respiration in Plants Chapter-Wise Test 9

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is known as the energy currency of the cell?

NADH
FADH₂
ATP
GTP
3

ATP (Adenosine Triphosphate) stores and transfers energy for cellular processes, making it the energy currency of the cell.

Which of the following is CORRECT about aerobic respiration?

It requires oxygen.
It occurs only in prokaryotic cells.
It does not involve the Electron Transport Chain.
It produces less ATP than anaerobic respiration.
1

Aerobic respiration requires oxygen and produces more ATP compared to anaerobic respiration.

Which of the following statements about the Krebs cycle is INCORRECT?

It takes place in the mitochondrial matrix.
NADH and FADH₂ are produced during the cycle.
Glucose directly enters the Krebs cycle.
CO₂ is released as a byproduct.
3

Glucose does not directly enter the Krebs cycle; it is first converted to pyruvate and then to Acetyl-CoA.

Which process ensures the regeneration of NAD⁺ in fermentation?

Reduction of pyruvate
Decarboxylation of glucose
Oxidation of NADH
ATP hydrolysis
3

NADH is oxidized back to NAD⁺ in fermentation, allowing glycolysis to continue in the absence of oxygen.

Which of the following is INCORRECT about ATP?

ATP is the main energy currency of the cell.
ATP is only produced during glycolysis.
ATP is required for active transport.
ATP releases energy when hydrolyzed to ADP.
2

ATP is produced in glycolysis, the Krebs cycle, and oxidative phosphorylation, not just glycolysis.

Which of the following is NOT an end product of fermentation?

Ethanol
Lactic acid
Carbon dioxide
Oxygen
4

Fermentation occurs in the absence of oxygen and produces ethanol or lactic acid along with carbon dioxide.

Which of the following is NOT a product of aerobic respiration?

ATP
Oxygen
Carbon dioxide
Water
2

Oxygen is consumed during aerobic respiration, while ATP, CO₂, and water are the end products.

Which intermediate of glycolysis is formed by the phosphorylation of glucose?

Fructose-1,6-bisphosphate
Glucose-6-phosphate
Dihydroxyacetone phosphate
Pyruvic acid
2

Glucose-6-phosphate is formed when glucose is phosphorylated in the first step of glycolysis.

Which of the following statements about the Krebs cycle is CORRECT?

It occurs in the cytoplasm.
It produces NADH and FADH₂.
It does not release carbon dioxide.
It is the final step of cellular respiration.
2

The Krebs cycle produces NADH and FADH₂, which are used in the Electron Transport Chain for ATP production.

Which enzyme catalyzes the first step of glycolysis?

Hexokinase
Phosphofructokinase
Pyruvate kinase
Aldolase
1

Hexokinase catalyzes the phosphorylation of glucose to form glucose-6-phosphate in glycolysis.

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