Plant Physiology - Respiration in Plants
Q. In which part of the plant does most respiration occur? (2020)
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A.
Roots
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B.
Leaves
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C.
Stems
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D.
Flowers
Solution
Most respiration occurs in the roots, where energy is needed for nutrient uptake and growth.
Correct Answer: A — Roots
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Q. In which part of the plant does respiration primarily occur? (2020)
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A.
Roots
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B.
Leaves
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C.
Stems
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D.
All parts
Solution
Respiration occurs in all parts of the plant, including roots, leaves, and stems.
Correct Answer: D — All parts
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Q. What is the main purpose of respiration in plants? (2023)
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A.
To produce glucose
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B.
To release energy
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C.
To absorb water
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D.
To synthesize proteins
Solution
The main purpose of respiration in plants is to release energy from glucose, which is essential for various cellular processes.
Correct Answer: B — To release energy
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Q. What is the main substrate for respiration in plants? (2023)
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A.
Starch
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B.
Glucose
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C.
Cellulose
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D.
Sucrose
Solution
Glucose is the main substrate for respiration in plants, as it is broken down to release energy.
Correct Answer: B — Glucose
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Q. What is the net gain of ATP molecules from one molecule of glucose during aerobic respiration? (2023)
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A.
2
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B.
18
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C.
30-32
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D.
36
Solution
The net gain of ATP molecules from one molecule of glucose during aerobic respiration is approximately 30-32 ATP.
Correct Answer: C — 30-32
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Q. What is the primary site of respiration in plant cells? (2021)
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A.
Chloroplast
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B.
Mitochondria
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C.
Cytoplasm
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D.
Nucleus
Solution
The primary site of respiration in plant cells is the mitochondria, where ATP is produced through cellular respiration.
Correct Answer: B — Mitochondria
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Q. What is the role of oxygen in aerobic respiration? (2019)
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A.
To produce glucose
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B.
To act as an electron acceptor
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C.
To release energy
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D.
To absorb carbon dioxide
Solution
Oxygen acts as the final electron acceptor in the electron transport chain during aerobic respiration.
Correct Answer: B — To act as an electron acceptor
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Q. What is the significance of the electron transport chain in respiration? (2023)
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A.
To produce glucose
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B.
To generate ATP
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C.
To release carbon dioxide
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D.
To absorb oxygen
Solution
The electron transport chain is significant in respiration as it generates ATP through oxidative phosphorylation.
Correct Answer: B — To generate ATP
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Q. Which enzyme is involved in the Krebs cycle during respiration? (2022)
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A.
ATP synthase
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B.
Hexokinase
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C.
Citrate synthase
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D.
Pyruvate kinase
Solution
Citrate synthase is an enzyme involved in the Krebs cycle, catalyzing the first step of the cycle.
Correct Answer: C — Citrate synthase
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Q. Which gas is released during the process of respiration in plants? (2022)
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A.
Oxygen
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B.
Carbon dioxide
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C.
Nitrogen
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D.
Hydrogen
Solution
Carbon dioxide is released as a byproduct during the process of respiration in plants.
Correct Answer: B — Carbon dioxide
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Q. Which of the following is NOT a product of cellular respiration? (2021)
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A.
ATP
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B.
Water
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C.
Glucose
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D.
Carbon dioxide
Solution
Glucose is not a product of cellular respiration; it is a reactant that is broken down to produce ATP, water, and carbon dioxide.
Correct Answer: C — Glucose
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Q. Which of the following is NOT a stage of cellular respiration? (2021)
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A.
Glycolysis
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B.
Krebs cycle
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C.
Electron transport chain
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D.
Calvin cycle
Solution
The Calvin cycle is part of photosynthesis, not cellular respiration.
Correct Answer: D — Calvin cycle
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Q. Which of the following processes occurs during aerobic respiration in plants? (2020)
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A.
Fermentation
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B.
Glycolysis
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C.
Anaerobic respiration
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D.
Photosynthesis
Solution
Glycolysis is the first step in aerobic respiration, where glucose is broken down to produce energy.
Correct Answer: B — Glycolysis
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Q. Which of the following statements about respiration in plants is true? (2022)
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A.
It occurs only at night
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B.
It is independent of photosynthesis
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C.
It produces more energy than fermentation
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D.
It only occurs in leaves
Solution
Respiration in plants produces more energy than fermentation, as it fully oxidizes glucose in the presence of oxygen.
Correct Answer: C — It produces more energy than fermentation
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