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All food chains begin with a plant because they absorb
energy from the sun by photosynthesis
Green plants are called producers because they make their
own food
They make their food by photosynthesis
Most photosynthesis takes place in the leaves of the
Chlorophyll ( the green colour ) in the leaves traps the
light energy from the sun
The energy is used to change water and carbon dioxide
into sugar and oxygen
Carbon dioxide + Water Light Glucose + Oxygen
6CO + 6H 0…read more

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What does the plant do with the glucose ?
Glucose…read more

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What affects the rate of photosynthesis ?
There are three main factors the affects the rate of
Carbon Dioxide
Carbon Dioxide…read more

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All three factors must be at an optimum ( best possible )
for the fastest rate of photosynthesis
These are called limiting factors because each one can
limit the rate of photosynthesis…read more

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How to test a leaf for starch
In this experiment two leaves are being tested for starch
1. First of all put the leaves in boiling water to this kill the
2. Secondly you put the leaves in a water bath, put the
leaves in a test tube and then put the test tube in boiling
water, you fill the test tube up with warm alcohol to
remove green colour
3.…read more

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In the leaf that had been partly covered with card the area
that had on, no photosynthesis took place as no light reached
the leaf.
In the variegated leaf, the whiter area means there is no
chlorophyll and so no photosynthesis took place. The green bit
goes blue.…read more

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The starch can be stored in the leaf cells and other parts
of the plant until it is needed
Plants respire all the time because they always need
energy but they can only photosynthesis during the day
when there is light
The rate of photosynthesis is much higher than the rate
of respiration, so there is always more oxygen produced
than used up…read more


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