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Work sheet
Plants for food
Plants use light energy to help them produce biomass, which contains a store of chemical energy.
Animals can get this chemical energy when they eat plants. So the energy in a food chain comes
originally from the Sun.
Plants use some of glucose made in photosynthesis for respiration. The rest is stored as starch or
used to make other substances needed for growth.
Starch is stored where it is needed most. Potatoes, for instance, contain starch to be used as a source
of energy for new potato plants to grow. The parts of a plant that don’t need a store of energy won’t
contain much starch.
We eat different parts of plants so that we get some of the many different substances needed for a
balanced diet.
Answer the following questions:
1. Write a list of plants that you have eaten today. Which parts of plant are these foods from
(e.g. stem, leaf, flower, root)?
2. What are the products of photosynthesis?
3. What are the products of respiration?
4. Why do plants turn glucose into starch?
5. The inner part of a tree trunk does not contain much starch. Why not?
6. Where does the chemical energy in your body originally come from?
• Revise Science. London: Hodder Education, 2007. ISBN 978 0 340 94300 7.
Gymnázium Globe, s.r.o.