Q1
Where does respiration occur in plants?
AAll plant cells
BOnly leaves
COnly roots
DOnly flowers
ICSEClass 9 (ICSE)BiologyCh 7 · Topic 2
Practice and Revision - Respiration in Plants
Let us practise and revise what we learned about respiration in plants. Plants respire continuously, breaking down glucose to release energy
Core concept
Respiration occurs in all plant cells, using oxygen to break down glucose, releasing energy, carbon dioxide, and water as byproducts.
How it works
Unlike photosynthesis (which only occurs in light), respiration occurs continuously, day and night, in all living plant cells.
Why it matters
The equation for respiration is: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy, showing glucose and oxygen converting to carbon dioxide, water, and energy.
Key detail
Understanding plant respiration helps us see how plants use stored energy from photosynthesis for growth and other life processes.
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Quick notes
• Respiration occurs in all plant cells.
• It uses oxygen to break down glucose.
• It releases energy, CO2 and water.
• Respiration occurs continuously, day and night.
• Photosynthesis only occurs in light.
• Equation: glucose+oxygen→CO2+water+energy.
• This energy supports growth and life processes.
• Respiration and photosynthesis are complementary.