AQA Additional Science Biology - How Plants Produce Food

Taken from the AQA Science Revision Guide, just thought I'd share it on here anyway :)

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  • Created on: 28-04-12 11:19
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B2.2 How Plants Produce Food
2.1 Photosynthesis
The equation for photosynthesis is:
Carbon Dioxide + Water (+ Light energy) Glucose + Oxygen
6 CO2 + 6 H2O C6H12O6 + 6 O2
The carbon dioxide is taken in by the leaves and the water by the roots.
The chlorophyll traps the energy needed for photosynthesis.
In photosynthesis the sugar (a carbohydrate) is made. Oxygen is given off as a gas waste.
Key Points
Photosynthesis can only be carried out by
Chlorophyll traps the Sun's energy.

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B2.2 How Plants Produce Food
2.3 How plants use Glucose
The product of photosynthesis is glucose. Glucose is used for respiration.
Glucose is also combined with other nutrients by the plant to produce new materials.
Glucose is stored, by some plants, as insoluble starch. It is stored as an insoluble substance so
that it has no effect on osmosis.…read more

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B2.2 How Plants Produce Food
2.4 Why do plants need minerals?
Plant roots take up mineral salts for healthy growth.
Nitrates are taken up from the soil for producing amino acids. These used to make proteins for
growth. A plant that does not take up enough nitrate (is nitrate deficient) will have stunted growth.
Plants also take up magnesium that is essential to produce chlorophyll. If the plant is deficient in
chlorophyll it will have yellow leaves.
Key Points
Plants produce sugars though photosynthesis.…read more


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