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Slide 1

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Photosynthesis…read more

Slide 2

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Carbon Dioxide + water Glucose + Oxygen
Photosynthesis is the chemical change which happens in
the leaves of green plants. It is the first step towards
making food Photosynthesis takes place in leaf cells.
These contain chloroplasts, which are tiny objects
containing chlorophyll.…read more

Slide 3

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Plants absorb water through
their roots, and carbon dioxide
through their leaves. Some
glucose is used for respiration,
while some is converted into
insoluble starch for storage. The
stored starch can later be turned
back into glucose and used in
respiration. Oxygen is released as
a by-product of photosynthesis.…read more

Slide 4

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Three factors can limit the speed of photosynthesis - light
intensity, carbon dioxide concentration and temperature.
If you plot the rate of photosynthesis against the levels of these
three limiting factors, you get graphs like the ones above.
In practice, any one of these factors could limit the rate of
photosynthesis.…read more

Slide 5

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Without enough light, a plant cannot photosynthesise very
quickly, even if there is plenty of water and carbon dioxide.
Increasing the light intensity will boost the speed of
photosynthesis.…read more

Slide 6

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Sometimes photosynthesis is limited by the concentration of
carbon dioxide in the air. Even if there is plenty of light, a plant
cannot photosynthesise if there is insufficient carbon dioxide.…read more

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