Respiration in plants MCQ with Answer and Explanation

Check below 100 mcq with answer and explanation for exam preparation.

1. Which of the following is the correct formula for the process of respiration in plants?

a) C₆H₁₂O₆ → 6CO₂ + 6H₂O + energy
b) C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy
c) C₆H₁₂O₆ + energy → 6CO₂ + 6H₂O
d) C₆H₁₂O₆ → 6CO₂ + H₂O + energy

Answer: b) C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy

Explanation: The correct formula for cellular respiration involves glucose (C₆H₁₂O₆) reacting with oxygen (O₂) to produce carbon dioxide (CO₂), water (H₂O), and energy.

2. Where does aerobic respiration take place in plant cells?

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

Answer: a) Mitochondria

Explanation: Aerobic respiration primarily occurs in the mitochondria, where energy is released through the breakdown of glucose in the presence of oxygen.

3. What is the energy currency of the cell produced during respiration?

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

Answer: a) ATP

Explanation: ATP (Adenosine triphosphate) is the energy currency of the cell, produced during respiration and used for cellular functions.

4. Which of the following is a byproduct of aerobic respiration?

a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Methane

Answer: c) Carbon dioxide

Explanation: Carbon dioxide (CO₂) is a byproduct of aerobic respiration, released during the breakdown of glucose.

5. During anaerobic respiration in plants, which of the following products is formed?

a) Alcohol (ethanol) and carbon dioxide
b) Lactic acid
c) Oxygen and glucose
d) Water and oxygen

Answer: a) Alcohol (ethanol) and carbon dioxide

Explanation: In the absence of oxygen, anaerobic respiration in plants produces ethanol and carbon dioxide, especially in yeast cells.

6. Which of the following statements is true about anaerobic respiration in plants?

a) It occurs in the presence of oxygen
b) It produces a large amount of energy
c) It results in the formation of alcohol and carbon dioxide
d) It takes place only in the mitochondria

Answer: c) It results in the formation of alcohol and carbon dioxide

Explanation: Anaerobic respiration occurs in the absence of oxygen and produces ethanol and CO₂ in plants.

7. What is the main function of respiration in plants?

a) To produce food
b) To release energy for cellular activities
c) To store water
d) To produce oxygen

Answer: b) To release energy for cellular activities

Explanation: The primary function of respiration in plants is to release energy for various cellular activities like growth, repair, and reproduction.

8. Which part of the plant carries out respiration?

a) Roots only
b) Leaves only
c) All living cells
d) Flowers only

Answer: c) All living cells

Explanation: All living cells in a plant carry out respiration, including cells in the roots, stems, leaves, and flowers.

9. In which process do plants consume oxygen and produce carbon dioxide?

a) Photosynthesis
b) Transpiration
c) Respiration
d) Germination

Answer: c) Respiration

Explanation: In respiration, plants consume oxygen and produce carbon dioxide as they break down glucose to release energy.

10. Which of the following is NOT a stage of cellular respiration?

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

Answer: c) Calvin cycle

Explanation: The Calvin cycle is part of photosynthesis, not cellular respiration. The stages of cellular respiration include glycolysis, the Krebs cycle, and the electron transport chain.