Respiration in Plants explains how plants release energy from organic compounds to carry out growth, maintenance, and metabolic activities. This category focuses on the biochemical pathways and mechanisms of respiration , making it suitable for Class 11–12 students , NEET aspirants , and undergraduate learners .
In this section, you will study:
Concept and significance of respiration in plants
Glycolysis and its steps
Krebs cycle and its role in energy release
Electron transport chain and oxidative phosphorylation
Anaerobic respiration and fermentation
Respiratory quotient and its significance
Factors affecting the rate of respiration
NCERT-based explanations, diagrams, flowcharts, MCQs, and exam-oriented questions
The content is structured to build clear conceptual understanding , strengthen pathway-based reasoning , and help students perform confidently in school examinations, NEET, and undergraduate assessments .
Develop a strong understanding of respiration as a vital life process that provides energy for all plant activities.
Q. During which part of the day do plants primarily perform respiration?
A.
Daytime only
B.
Nighttime only
C.
Both day and night
D.
Only during photosynthesis
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Solution
Plants perform respiration both day and night, although photosynthesis occurs primarily during the day.
Correct Answer:
C
— Both day and night
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Q. In which part of the plant does cellular respiration primarily occur?
A.
Roots
B.
Leaves
C.
Stems
D.
All parts
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Solution
Cellular respiration occurs in all parts of the plant, as all cells require energy to function.
Correct Answer:
D
— All parts
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Q. What gas is primarily consumed during the process of respiration in plants?
A.
Oxygen
B.
Carbon dioxide
C.
Nitrogen
D.
Hydrogen
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Solution
Oxygen is primarily consumed during respiration, as it is used to oxidize glucose to release energy.
Correct Answer:
A
— Oxygen
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Q. What gas is primarily consumed during the respiration process in plants?
A.
Oxygen
B.
Carbon dioxide
C.
Nitrogen
D.
Hydrogen
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Solution
Oxygen is primarily consumed during respiration, as it is used to oxidize glucose to release energy.
Correct Answer:
A
— Oxygen
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Q. What is the end product of anaerobic respiration in plants?
A.
Lactic acid
B.
Ethanol
C.
Carbon dioxide
D.
Glucose
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Solution
The end product of anaerobic respiration in plants is ethanol, which is produced when oxygen is not available.
Correct Answer:
B
— Ethanol
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Q. What is the main difference between aerobic and anaerobic respiration in plants?
A.
Oxygen requirement
B.
Energy yield
C.
Location in the plant
D.
Type of glucose used
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Solution
The main difference is that aerobic respiration requires oxygen, while anaerobic respiration does not.
Correct Answer:
A
— Oxygen requirement
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Q. What is the main difference between respiration and photosynthesis in plants?
A.
Respiration occurs only at night
B.
Photosynthesis produces energy, respiration consumes it
C.
Respiration occurs in chloroplasts, photosynthesis in mitochondria
D.
Photosynthesis requires light, respiration does not
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Solution
Photosynthesis requires light to produce glucose, while respiration does not require light and occurs continuously.
Correct Answer:
D
— Photosynthesis requires light, respiration does not
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Q. What is the primary purpose of respiration in plants?
A.
To produce glucose
B.
To release energy
C.
To absorb carbon dioxide
D.
To synthesize chlorophyll
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Solution
The primary purpose of respiration in plants is to release energy from glucose, which is used for various metabolic processes.
Correct Answer:
B
— To release energy
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Q. What is the relationship between photosynthesis and respiration in plants?
A.
They are the same process
B.
Photosynthesis produces oxygen for respiration
C.
Respiration produces glucose for photosynthesis
D.
They occur in different organisms
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Solution
Photosynthesis produces oxygen, which is then used in respiration, highlighting their interdependent relationship.
Correct Answer:
B
— Photosynthesis produces oxygen for respiration
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Q. What is the role of mitochondria in plant cells?
A.
Photosynthesis
B.
Energy production
C.
Water storage
D.
Nutrient absorption
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Solution
Mitochondria are known as the powerhouses of the cell, where energy production through respiration occurs.
Correct Answer:
B
— Energy production
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Q. Which of the following factors can affect the rate of respiration in plants?
A.
Temperature
B.
Light intensity
C.
Soil moisture
D.
All of the above
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Solution
All of the above factors can affect the rate of respiration in plants, influencing their metabolic processes.
Correct Answer:
D
— All of the above
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Q. Which of the following is a byproduct of aerobic respiration in plants?
A.
Oxygen
B.
Glucose
C.
Carbon dioxide
D.
Water
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Solution
Carbon dioxide is a byproduct of aerobic respiration, released when glucose is oxidized.
Correct Answer:
C
— Carbon dioxide
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Q. Which of the following is a byproduct of respiration in plants?
A.
Oxygen
B.
Glucose
C.
Carbon dioxide
D.
Starch
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Solution
Carbon dioxide is a byproduct of respiration, released when glucose is broken down for energy.
Correct Answer:
C
— Carbon dioxide
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Q. Which of the following processes occurs during plant respiration?
A.
Photosynthesis
B.
Glycolysis
C.
Transpiration
D.
Nitrogen fixation
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Solution
Glycolysis is a key process that occurs during respiration, breaking down glucose to release energy.
Correct Answer:
B
— Glycolysis
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Q. Which organelle is primarily responsible for respiration in plant cells?
A.
Chloroplast
B.
Mitochondria
C.
Nucleus
D.
Endoplasmic reticulum
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Solution
Mitochondria are the organelles responsible for respiration, where energy production occurs.
Correct Answer:
B
— Mitochondria
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Q. Which type of respiration occurs in the absence of oxygen?
A.
Aerobic respiration
B.
Anaerobic respiration
C.
Fermentation
D.
Both anaerobic respiration and fermentation
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Solution
Both anaerobic respiration and fermentation occur in the absence of oxygen, allowing plants to generate energy.
Correct Answer:
D
— Both anaerobic respiration and fermentation
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Q. Which type of respiration occurs in waterlogged soils where oxygen is limited?
A.
Aerobic respiration
B.
Anaerobic respiration
C.
Fermentation
D.
Photosynthesis
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Solution
Anaerobic respiration occurs in waterlogged soils where oxygen is limited, allowing plants to survive in low-oxygen conditions.
Correct Answer:
B
— Anaerobic respiration
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