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B4 - Bioenergetics
Photosynthesis
Photosynthetic Rate
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Cards (15)
Photosynthetic rate
The rate at which plants take in carbon dioxide, water and the energy from sunlight to produce
glucose
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Chlorophyll
A green pigment in plants that absorbs
light
energy used to carry out
photosynthesis
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Role
of enzymes
Photosynthesis
is an enzyme-controlled reaction where the enzymes are needed to convert carbon dioxide into
glucose
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Temperature
Increases the rate of
reaction
up to an optimum rate, after which the denaturation of
enzymes
will occur
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Sunlight
Is needed as an energy
source
for
photosynthesis
to occur
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Carbon dioxide (CO2)
Enters the plant through the stomata during
gas exchange
and is the source of carbon needed to make
glucose
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Temperature
effect
Photosynthesis
rate increases to an optimum and then
decreases
due to denaturing enzymes
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Light intensity effect
Photosynthesis rate
increases
and then plateaus due to another
limiting
factor such as temperature or carbon dioxide
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Carbon
dioxide concentration effect
Photosynthesis rate
increases
and then plateaus due to another
limiting factor
such as temperature or light intensity
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Chlorophyll
effect
Plants with diseases or variegated leaves may have less chlorophyll which
reduces
the rate of
photosynthesis
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Limiting
factor
An environmental factor that prevents photosynthetic rate from
increasing
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Three
main limiting factors
Temperature,
light intensity
and
carbon dioxide concentration
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Plateau
Where a
graph
levels off and no longer
increases
past a certain point
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Inverse-square law
Light
intensity
is inversely proportional to the square of the
distance
from a light source
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Inversely proportional relationship
As the distance of light from a plant
increases
, the light intensity
decreases
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