Cambridge IGCSE Biology (0610) - IGCSE Biology - Transpiration (8.3)

🎓 IGCSE Biology - The Complete Course: https://www.tes.com/teaching-resource/resource-12989155 IGCSE Chemistry - The Complete Course: 🎓 Complete Teaching Resource (including past exam questions and mark schemes organised by chapter): https://www.tes.com/teaching-resource/resource-13280954 🎓 Student resource (PDF only): https://www.tes.com/teaching-resource/resource-13245244 🎓 All the videos (the complete library on Patreon): https://www.patreon.com/igbiocomplete ☕️ Buy me a coffee - https://www.buymeacoffee.com/ArthurJohnParker Cambridge IGCSE Biology (0610/0970) Chapter 8 - Transport in plants Topic 8.3 - Transpiration For exams from 2025 (core and extended) As always this video follows the Cambridge syllabus exactly and contains absolutely everything you need to know for your final exam! My other channels: @igpecomplete - Cambridge IGCSE PE @ocrpecomplete - OCR GCSE PE Timestamps: 0:00 Contents 0:33 Transpiration 1:03 Rate of transpiration 2:17 Air spaces and stomata (extended) 3:17 Transpiration pull (extended) 3:44 Temperature, wind speed and humidity (extended) 4:50 Wilting (extended) Core content: - Describe transpiration as the loss of water vapour from leaves. - State that water evaporates from the surfaces of the mesophyll cells into the air spaces and then diffuses out of the leaves through the stomata as water vapour. - Investigate and describe the effects of variation of temperature and wind speed on transpiration rate. Extended content: - Explain how water vapour loss is related to: the large internal surface area provided by the interconnecting air spaces between mesophyll cells and the size and number of stomata. - Explain the mechanism by which water moves upwards in the xylem in terms of a transpiration pull that draws up a column of water molecules, held together by forces of attraction (cohesion) between water molecules. - Explain the effects on the rate of transpiration of varying the following factors: temperature, wind speed and humidity. - Explain how and why wilting occurs.