- Help pupils to make a summary of the key points about photosynthesis. Provide them with information on earlier ideas about the growth of plants,
eg Van Helmont's conclusions about a willow tree's growth before carbon dioxide was known; the work of Joseph Priestley, and, using the key points, discuss with them how knowledge about gases in the air and cells has helped to change ideas.
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- identify key ideas and summarise them correctly
- recognise that scientists draw conclusions from evidence in the light of what is currently known
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