Respiration in Plant
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Transcript of Respiration in Plant
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Respiration In
Plants
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Energy requirement in plants
• The energy requirement for living processes of plants is lower compared to animals. Why?
Because plants are less active than animals. Plants do not move about like animal do.
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The Intake Of Oxygen By Plants For Respiration
• Plants do not have specialised breathing mechanisms for gaseous exchange.
• Gaseous exchange between plants cells and the environment occurs by diffusion through stomata and lenticels.
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stomatastomata
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lenticelslenticels
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Gaseous exchange in the light
• When the leaf is photosynthesising,
CO2 concentration ↑ in the air spaces of the spongy layer. (what will happen?)
O2 diffuses from the atmosphere through stomata into the leaf for cell respiration.
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Gaseous exchange in the dark
• Respiration alone is taking place.
< O2 in the air spaces than atm. O2 diffuses inward though lenticels. Stomata are normally closed at night.
CO2 will diffuse outwards.
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Aerobic & Anaerobic Respiration
in Plants.
C6H12O6 + 6O2 6CO2 + 6H2O + Energy
2880 kJ / m
C6H12O6 2C2H5OH + 2CO2 + Energy
210 kJ / m
Aerobic @ Anaerobic ?
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Aerobic respiration in plants
• Need O2, waste products are CO2 and water.
• In the light, photosynthesis is faster than
respiration. The CO2 produced is quickly used
up by photosynthesis.
• In the dark, respiration continues.
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Anaerobic respiration in plants
• Yeast respires anaerobically to produce alcohol (alcoholic fermentation).
• During flooding, plants can survive for several days completely submerged in water.
• Young rice plants are planted in fields that are muddy and flooded.
• During initial stages of germination, embryo is completely enclosed within an airtight seed coat.
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Respiration & Photosynthesis
• Respiration is the reverse of photosynthesis.
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Compare & Contrast Respiration & Photosynthesis
Respiration Photosynthesis
Similarities
• Both take place in living cells. • Both are metabolic process.
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Respiration PhotosynthesisA process of
catabolism (breaking down of organic
materials)
A process of anabolism
(synthesis of organic materials)
Occurs in all living cells
Occurs in cells containing chlorophyll.
Take place in the presence / absence
of light
Takes place only in the presence of light
Differences
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Respiration Photosynthesis
Uses glucose and oxygen
Uses carbon dioxide and water
Produces carbon dioxide and water
Produces glucose and oxygen
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Respiration Photosynthesis
Chemical energy is converted into heat and energy ATP.
Solar energy is converted into
chemical energy
Cell loses weight Cell gains weight
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Light Intensity
& The
Compensation
Point
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CO2 concentrations in air around plants throughout the day
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CO2 O2
Day
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O2 CO2
night
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O2 CO2
All the CO2 produced during respiration is reused during photosynthesis
Compensation point
Light intensity
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The Compensation Point
The light intensity at which the rate of carbon
dioxide production during respiration is equal to that of carbon dioxide consumption during
photosynthesis.
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If the rate of photosynthesis and the rate of respiration remained at compensation point:
• The plant would not be able to store food.
• There would be no growth and development in green plants.
• No oxygen released into the atmosphere to sustain living things.