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Home/ Uncategorised/Respiration in plants MCQ with Answer and Explanation

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On: January 3, 2025 Posted in Uncategorised Comments: 0 Views: 239

Respiration in plants MCQ with Answer and Explanation

  1. What happens to pyruvate produced during glycolysis in the presence of oxygen?

a) It is converted into ethanol
b) It enters the Krebs cycle
c) It is stored as glycogen
d) It is broken down into glucose

Answer: b) It enters the Krebs cycle

Explanation: In the presence of oxygen, pyruvate is transported to the mitochondria and enters the Krebs cycle for further breakdown.

  1. What is the role of NADH and FADH₂ in cellular respiration?

a) They are produced in the electron transport chain
b) They carry electrons to the electron transport chain
c) They are converted into glucose
d) They act as enzymes in glycolysis

Answer: b) They carry electrons to the electron transport chain

Explanation: NADH and FADH₂ are electron carriers that transfer high-energy electrons to the electron transport chain during cellular respiration.

  1. Which of the following is a characteristic of the Krebs cycle?

a) It occurs in the cytoplasm
b) It requires oxygen
c) It is part of anaerobic respiration
d) It directly produces glucose

Answer: b) It requires oxygen

Explanation: The Krebs cycle, also known as the citric acid cycle, takes place in the mitochondria and requires oxygen to proceed.

  1. Which molecule is primarily produced during the Krebs cycle that is used in the electron transport chain?

a) Glucose
b) Oxygen
c) ATP
d) NADH and FADH₂

Answer: d) NADH and FADH₂

Explanation: NADH and FADH₂ are produced during the Krebs cycle and carry electrons to the electron transport chain, where ATP is generated.

  1. Which is the primary function of oxygen in cellular respiration?

a) To produce glucose
b) To release carbon dioxide
c) To act as the final electron acceptor
d) To convert glucose to pyruvate

Answer: c) To act as the final electron acceptor

Explanation: Oxygen serves as the final electron acceptor in the electron transport chain, enabling the chain to continue and ATP to be produced.

  1. How many molecules of ATP are generated by one molecule of glucose during aerobic respiration?

a) 2
b) 36
c) 38
d) 4

Answer: c) 38

Explanation: Under ideal conditions, the complete breakdown of one glucose molecule in aerobic respiration yields 38 ATP molecules.

  1. What is the role of the electron transport chain in respiration?

a) It synthesizes glucose
b) It produces lactic acid
c) It generates a proton gradient across the mitochondrial membrane
d) It produces ethanol

Answer: c) It generates a proton gradient across the mitochondrial membrane

Explanation: The electron transport chain generates a proton gradient across the mitochondrial membrane, which drives ATP synthesis.

  1. In which organelle does the majority of ATP production occur during aerobic respiration?

a) Nucleus
b) Chloroplast
c) Mitochondrion
d) Ribosome

Answer: c) Mitochondrion

Explanation: Mitochondria are the sites of aerobic respiration, where the majority of ATP is produced.

  1. Which of the following is true about glycolysis?

a) It requires oxygen
b) It produces ATP
c) It occurs in the mitochondria
d) It produces glucose

Answer: b) It produces ATP

Explanation: Glycolysis occurs in the cytoplasm and produces a small amount of ATP by breaking down glucose into pyruvate.

  1. What is the final product of anaerobic respiration in human muscle cells?

a) Carbon dioxide
b) Ethanol
c) Lactic acid
d) Glucose

Answer: c) Lactic acid

Explanation: In human muscle cells, anaerobic respiration results in the production of lactic acid when oxygen is not available.

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