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CHAPTER-14 RESPIRATION IN PLANTS
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CHAPTER-14 RESPIRATION IN PLANTS
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CBSE Quick Revision Notes (Class-11 Biology)CHAPTER-14 RESPIRATION IN PLANTS
Respiration is an energy releasing enzymatically controlled catabolic process which involves
a step-wise oxidative breakdown of food substance inside living cells.
• Living organism require energy for all activities like absorption, movement, reproduction or
even breathing. Energy required is obtained from oxidation of food during respiration.
• Cellular respiration is the mechanism of breaking down of food materials within the cell to
release energy for synthesis of ATP.
• Breaking down of complex molecules takes place to produce energy in cytoplasm and in the
mitochondria.
• Breaking down of C-C bond of complex compounds through oxidation within the cells
leading to release of considerable amount of energy is called respiration. The compounds
that get oxidized is called respiratory substrates.
• Energy released during oxidation is not used directly but utilized in synthesis of ATP, which
is broken down when energy is required. Therefore, ATP is called energy currency of cells.
• The process of respiration requires oxygen. In plants oxygen is taken in by stomata, lenticels
and root hairs.
• Plants can get along without respiratory organs because
a. Each plant part takes care of its own gas-exchange needs.
b. Plants do not present great demands for gas exchange.
c. Distance that gases must diffuse in large plant is not great.
d. During photosynthesis O2 is released in leaves and diffuse to other part of leaves.
• During process of respiration oxygen is utilized and carbon dioxide and water is released
along with energy molecules in form of ATP.
• Respiratory Quotient is the ratio of the volume of carbon dioxide produced to the volume
of oxygen consumed in respiration over a period of time. RQ is equal to one for carbohydrate
and less than one for protein and peptones.
Respiration
Aerobic Respiration Anaeborbic Respiration
Aerobic Respiration is an
enzymatically controlled release of
energy in a stepwise catabolic
process of complete oxidation of
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