Transpiration — Cambridge IGCSE Combined Science
Transpiration as the loss of water vapour from leaves, how temperature and wind speed affect its rate, and measuring it with a potometer.
Revision notes
2 short notes, in the order of the specification. Each one in short:
Transpiration is the loss of water vapour from leaves: water evaporates from mesophyll cells and the vapour diffuses out through the stomata.
Transpiration is faster at higher temperature and higher wind speed and slower in humid air; a potometer measures water uptake by a cut shoot.
Exam questions
2 exam-style questions (6 marks), each with its mark scheme.
Answer the questionsFlashcards
3 cards: flip them, mark what you knew, and practise the rest.
Practise the cardsMind map
The whole of transport in plants on one page, so you can see where this subtopic fits.
Open the mind mapPractical sheet
Method, variables, risks and a results table, with questions to answer.
Print it
Free PDFs to print or save.
Quick check questions
Define transpiration.
Show answer
The loss of water vapour from leaves.
Supplement Name two factors that increase the rate of transpiration when they increase.
Show answer
Temperature and wind speed.
Written and checked against the Cambridge IGCSE Combined Science (0653) specification · Updated October 2026