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Slide 2

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All the graphs below
Photosynthesis show the limiting
factors that affect
Carbon Dioxide + Water Oxygen + glucose
Rate of photosynthesis
Increasing the light Light ­ If there is more light,
intensity to higher levels
has no effect on the photosynthesis happens faster.
overall rate of
Increasing light
Temperature - the best temperature is
Rate of photosynthesis
Photosynthesis is above 30 0c nothing above 40 0c will
controlled by enzymes ­
these denature at slow photosynthesis right down, the
temperatures above 40 enzymes will denature.
40 0c
Rate of photosynthesis
Photosynthesis Carbon dioxide - if there is more
increases at first but is
then limited by a lack of
carbon dioxide photosynthesis will
increase in temp or light. happen quicker.
Level of co2…read more

Slide 3

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Photosynthesis continued....
Sunlight gives the Chlorophyll ­ the
plant energy green pigment
where the chemical
reactions happen
Water ­ enters the The glucose produced by
roots by osmosis photosynthesis is used by
and travels up the the plant for energy
xylem from the (through respiration). It is
roots. stored in the plant as
starch. Chlorophyll is a
substance that absorbs
Carbon Dioxide sunlight.
enters the leaf by
diffusion through
stomata on the Carbon Oxygen +
underneath. Water
Dioxide + glucose…read more

Slide 4

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An example of pollution is eutrophication.This is when lakes become stagnant due to careless use of fertiliser.
There are six steps:
1) Inorganic fertilisers used on fields are washed
into the lake.
2) The fertiliser causes increased growth in water
3) This growth leads to competition and many
plants die due to lack of light or space.
4) Micro ­ organisms and bacteria increase in
number due to the extra dead material.
5) These micro ­ organisms use up the
oxygen in the lake during respiration.
6) The lack of oxygen causes the death of fish
and other aquatic animals.…read more


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