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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: 240

Respiration in plants MCQ with Answer and Explanation

  1. During glycolysis, glucose is broken down into:

a) Two molecules of lactic acid
b) Two molecules of pyruvate
c) One molecule of glucose-6-phosphate
d) Two molecules of NADH

Answer: b) Two molecules of pyruvate

Explanation: Glycolysis breaks one molecule of glucose into two molecules of pyruvate.

  1. Which of the following is true regarding aerobic respiration?

a) It occurs in the absence of oxygen
b) It occurs only in plants
c) It is less efficient than anaerobic respiration
d) It produces carbon dioxide and requires oxygen

Answer: d) It produces carbon dioxide and requires oxygen

Explanation: Aerobic respiration involves oxygen and produces carbon dioxide, water, and energy in the form of ATP.

  1. Which molecule is directly involved in the transfer of energy during the Krebs cycle?

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

Answer: d) NADH and FADH₂

Explanation: NADH and FADH₂ carry high-energy electrons to the electron transport chain after the Krebs cycle.

  1. Where in the plant does alcoholic fermentation occur?

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

Answer: c) Cytoplasm

Explanation: Alcoholic fermentation takes place in the cytoplasm of plant cells, typically in yeast cells.

  1. How many molecules of ATP are produced during the Krebs cycle from one molecule of glucose?

a) 2
b) 6
c) 4
d) 38

Answer: b) 6

Explanation: The Krebs cycle produces 2 ATPs per glucose molecule (because each glucose molecule produces two molecules of pyruvate, each of which enters the cycle).

  1. What is the net gain of ATP from one glucose molecule during glycolysis?

a) 1
b) 2
c) 3
d) 4

Answer: b) 2

Explanation: Glycolysis produces 4 ATP molecules, but 2 ATPs are consumed during the process, resulting in a net gain of 2 ATP molecules.

  1. Which molecule is produced during the reduction of NAD+ in glycolysis and the Krebs cycle?

a) NADH
b) FADH₂
c) Glucose
d) ATP

Answer: a) NADH

Explanation: NAD+ is reduced to form NADH during glycolysis and the Krebs cycle, which carries electrons to the electron transport chain.

  1. Which of the following is an anaerobic process?

a) Glycolysis
b) Krebs cycle
c) Electron transport chain
d) Citric acid cycle

Answer: a) Glycolysis

Explanation: Glycolysis is the only stage of cellular respiration that occurs in the absence of oxygen (anaerobic).

  1. Which part of the plant cell is responsible for generating ATP during cellular respiration?

a) Nucleus
b) Chloroplast
c) Mitochondrion
d) Endoplasmic reticulum

Answer: c) Mitochondrion

Explanation: The mitochondria are the “powerhouses” of the cell, generating ATP through cellular respiration.

  1. Which is the main product of the electron transport chain?

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

Answer: b) ATP

Explanation: The electron transport chain is responsible for producing the majority of ATP during cellular respiration.

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