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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: 247

Respiration in plants MCQ with Answer and Explanation

  1. In which part of the plant does the Krebs cycle occur?

a) Cytoplasm
b) Chloroplasts
c) Nucleus
d) Mitochondria

Answer: d) Mitochondria

Explanation: The Krebs cycle occurs in the mitochondria, where acetyl-CoA is oxidized to produce ATP, NADH, FADH₂, and carbon dioxide.

  1. In aerobic respiration, what happens to the energy released from glucose?

a) It is used to form oxygen
b) It is stored in ATP molecules
c) It is lost as heat
d) It is stored as fat

Answer: b) It is stored in ATP molecules

Explanation: The energy released from glucose is stored in the high-energy bonds of ATP molecules during aerobic respiration.

  1. What is the main purpose of fermentation in cells?

a) To produce oxygen
b) To regenerate NAD+
c) To produce glucose
d) To generate carbon dioxide

Answer: b) To regenerate NAD+

Explanation: Fermentation regenerates NAD+ so that glycolysis can continue in the absence of oxygen.

  1. Which of the following is a product of lactic acid fermentation in animal cells?

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

Answer: c) Lactic acid

Explanation: Lactic acid fermentation produces lactic acid as a byproduct in animal cells when oxygen is scarce.

  1. Which of the following processes produces the most ATP?

a) Glycolysis
b) Fermentation
c) Krebs cycle
d) Electron transport chain

Answer: d) Electron transport chain

Explanation: The electron transport chain produces the most ATP during cellular respiration.

  1. Which of the following occurs during the process of oxidative phosphorylation?

a) Glucose is converted into pyruvate
b) Oxygen is consumed and water is produced
c) ATP is consumed
d) Glucose is converted into lactic acid

Answer: b) Oxygen is consumed and water is produced

Explanation: During oxidative phosphorylation, oxygen is consumed as the final electron acceptor and combines with electrons and protons to form water.

  1. Which of the following is a common feature of both aerobic and anaerobic respiration?

a) Oxygen is required
b) Water is produced
c) Glycolysis occurs
d) Carbon dioxide is released

Answer: c) Glycolysis occurs

Explanation: Glycolysis occurs in both aerobic and anaerobic respiration, breaking down glucose into pyruvate.

  1. Which of the following is a byproduct of fermentation in plant cells?

a) Glucose
b) Lactic acid
c) Alcohol (ethanol)
d) Oxygen

Answer: c) Alcohol (ethanol)

Explanation: In yeast cells and some plant cells, fermentation produces alcohol (ethanol) and carbon dioxide.

  1. What is the role of oxygen in aerobic respiration?

a) It is used to break down glucose
b) It acts as the final electron acceptor
c) It is converted into glucose
d) It produces ATP directly

Answer: b) It acts as the final electron acceptor

Explanation: Oxygen acts as the final electron acceptor in the electron transport chain, enabling ATP production.

  1. Which of the following is the correct order of the stages of aerobic respiration?

a) Glycolysis → Krebs cycle → Electron transport chain
b) Glycolysis → Electron transport chain → Krebs cycle
c) Electron transport chain → Glycolysis → Krebs cycle
d) Krebs cycle → Glycolysis → Electron transport chain

Answer: a) Glycolysis → Krebs cycle → Electron transport chain

Explanation: The correct sequence of stages in aerobic respiration is glycolysis, followed by the Krebs cycle, and then the electron transport chain.

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