This key facts covers Key Facts About Transpiration within Transpiration for GCSE Biology. Transpiration process, stomatal control, factors affecting rate, plant adaptations, measuring transpiration, and practical investigations It is section 2 of 21 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Key Facts About Transpiration
- Water loss scale: 99% of water absorbed is lost through transpiration
- Cooling effect: Can reduce leaf temperature by 10-15°C
- Transport height: Creates negative pressure pulling water up to 120m in tall trees
- Stomatal density: Leaves have 100-300 stomata per mm²
- Daily rhythm: Most transpiration occurs during daylight hours
- Desert adaptations: CAM plants lose 90% less water than normal plants
Practice questions for Transpiration
What is transpiration?
Describe the three stages of transpiration in a leaf.
Quick recall flashcards
What is a xerophyte?
A plant adapted to survive in dry/arid conditions with limited water availability (e.g., cacti, marram grass).
What is a potometer?
An apparatus that measures the rate of water uptake by a plant shoot. Used to estimate transpiration rate (though actually measures uptake, not loss).