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AQA Biology
Limiting Factors
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Photosynthesis
Process where
light energy
is absorbed by chlorophyll and used to react carbon dioxide with water to make the sugar
glucose
, with oxygen as a product
Photosynthesis
1.
Light
energy absorbed by
chlorophyll
2. React
carbon dioxide
with
water
3. Make
sugar glucose
4.
Oxygen
produced
Limiting factors in photosynthesis
Light intensity
Carbon dioxide concentration
Temperature
Amount of
chlorophyll
in leaves
Light intensity increases
Rate of
photosynthesis
increases
Light intensity is the limiting factor
Rate of
photosynthesis
is limited by
light intensity
Carbon dioxide concentration increases
Rate of
photosynthesis
increases
Carbon dioxide concentration is the limiting factor
Rate of
photosynthesis
is limited by
carbon dioxide
concentration
Temperature increases
Rate of photosynthesis
increases
Temperature
is the limiting factor
Rate of photosynthesis is limited by
temperature
Enzymes in leaf start to denature
Rate of photosynthesis
falls
Greenhouses
Farmers use them to
increase
the rate of
photosynthesis
Provide extra
light
and
heat
Add extra
carbon dioxide
The extra cost of using greenhouses has to be justified by the
increase
in crop yield