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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: 243

Respiration in plants MCQ with Answer and Explanation

  1. Which enzyme is involved in the breakdown of glucose in glycolysis?

a) Amylase
b) Hexokinase
c) Sucrase
d) Lactase

Answer: b) Hexokinase

Explanation: Hexokinase is the enzyme that catalyzes the phosphorylation of glucose to form glucose-6-phosphate, the first step in glycolysis.

  1. Which of the following compounds is produced in the Krebs cycle?

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

Answer: a) NADH

Explanation: NADH is produced during the Krebs cycle (Citric acid cycle) as part of the process of breaking down glucose molecules.

  1. Which of the following statements about the electron transport chain is true?

a) It produces glucose
b) It occurs in the cytoplasm
c) It takes place in the mitochondria
d) It uses sunlight to generate energy

Answer: c) It takes place in the mitochondria

Explanation: The electron transport chain occurs in the mitochondria and produces the majority of ATP during cellular respiration.

  1. What is the final electron acceptor in the electron transport chain during aerobic respiration?

a) Carbon dioxide
b) Oxygen
c) NADH
d) Glucose

Answer: b) Oxygen

Explanation: Oxygen acts as the final electron acceptor in the electron transport chain, combining with electrons and protons to form water.

  1. Which of the following is true about fermentation in plants?

a) It is an aerobic process
b) It does not produce energy
c) It results in the production of lactic acid
d) It occurs in the absence of oxygen

Answer: d) It occurs in the absence of oxygen

Explanation: Fermentation occurs when oxygen is unavailable and leads to the production of ethanol and carbon dioxide in plants.

  1. During anaerobic respiration in plants, the process of fermentation is important because it:

a) Regenerates NAD+
b) Produces ATP
c) Requires oxygen
d) Forms glucose

Answer: a) Regenerates NAD+

Explanation: Fermentation helps regenerate NAD+ from NADH, which is crucial for glycolysis to continue in the absence of oxygen.

  1. Which of the following is a product of alcoholic fermentation in plants?

a) Lactic acid
b) Oxygen
c) Ethanol
d) Acetyl-CoA

Answer: c) Ethanol

Explanation: Alcoholic fermentation results in the production of ethanol and carbon dioxide as byproducts.

  1. Which of the following statements is true for the breakdown of glucose in both aerobic and anaerobic respiration?

a) Both processes start with glycolysis
b) Only aerobic respiration produces ATP
c) Anaerobic respiration produces more ATP than aerobic respiration
d) Both processes produce oxygen

Answer: a) Both processes start with glycolysis

Explanation: Both aerobic and anaerobic respiration begin with glycolysis, where glucose is broken down into pyruvate.

  1. Which is the primary function of mitochondria in plant cells?

a) Photosynthesis
b) Respiration
c) Protein synthesis
d) Hormone production

Answer: b) Respiration

Explanation: Mitochondria are the powerhouses of the cell and are responsible for producing energy through the process of cellular respiration.

  1. Which of the following is the correct sequence of steps in cellular respiration?

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

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

Explanation: The correct sequence of steps in cellular respiration is glycolysis, followed by the Krebs cycle, and finally, the electron transport chain.

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