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1. Read textbook pages 183-185.

2. Make notes on the factors affecting rate of transpiration using the table on the page 'Factors affecting transpiration', which you can find in '10. Water transport'. You learnt about some of these factors at IGCSE level, but will need to do some of your own research to complete the table to an A Level standard.

3. Read through the evidence for cohesion-tension theory on the page '10. Water transport' and then answer the two questions alongside.