AQA Biology, B2 - How Plants Produce Its Food

This is the revision notes I made for GCSE Biology, Unit 2, How Plants Produce Its Food.

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  • Created on: 21-03-11 12:39
Preview of AQA Biology, B2 - How Plants Produce Its Food

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Biology Revision
B2.2 ­ How Plants Produce Food
Key Words
Photosynthesis ­ the process by which plants make food using carbon dioxide, water and light
Chloroplasts ­ the organelles in which photosynthesis takes place
Chlorophyll ­ the green pigment contained in the chloroplasts
Glucose ­ a simple sugar
Limiting factors ­ factors which limit the rate of a reaction, e.g. photosynthesis
Phloem ­ the living transport tissue in plants which carries sugars around the plant
Xylem ­ the non-living transport tissue in plants, which transports water around the plant
Soluble ­ able to dissolve in a given solvent
Insoluble ­ unable to dissolve in a given solvent
Nitrogen ­ inert gas making up around 80% of the Earth's atmosphere
Nitrates ­ mineral ions needed by plants to form proteins
Magnesium ­ a metallic element. Magnesium ions are needed by plants to make chlorophyll
Hydroponics ­ growing plants in water enriched by mineral ions rather than soil
Photosynthesis is the method plants get feed from and gets its energy.
Note: Starch is insoluble so it can be stored without any osmotic effect.
The cells in the leaves of a plant are full of small green parts called chloroplasts. They contain a
green substance called chlorophyll.
During photosynthesis, light energy is absorbed by the chlorophyll in the chloroplasts. This energy is
then used to convert carbon dioxide from the air plus water from the soil into a simple sugar called
glucose. The chemical reaction also produces oxygen gas. This is released into the air.
Proving Photosynthesis

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Iodine solution is a yellowy-brown solution which turns dark blue when it reacts with starch.…read more

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Plants use some of the energy from respiration to combine sugars with other nutrients from
the soil to make amino acids. These amino acids are then built up into proteins to be used in
the cells. Energy from respiration is also used to build up fats and oils to make a food store in
the seeds.
Transport and Storage
Plants make food by photosynthesis in their leaves and other green parts. However, the food is
needed all over the plant.…read more

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When plants die and decay the nitrates and other minerals are returned to the soil to be used by
other plants.
If a plant does not get enough minerals, its growth will be poor.…read more


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