GCSE Combined Science (AQA)

622 videos | 38 hours

Factors Affecting Transpiration

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Organisation Plant Tissues, Organs and Systems

Factors Affecting Transpiration

6:10 Investigating Transpiration
Spec 4.2.3.2
Previous Transpiration Use in Plants Next Investigating Transpiration Rate
  • Transpiration is linked to photosynthesis, requiring open stomata to allow CO2 into the plant.
  • Stomata also facilitate water evaporation from the leaf.
  • Factors that increase photosynthesis (e.g., light intensity, temperature, air movement) also increase transpiration.
  • Increased temperature causes more water evaporation due to increased particle movement.
  • Increased air movement enhances evaporation and transpiration by removing water vapor from the leaf surface.
  • Higher light intensity causes stomata to open wider, increasing both CO2 intake for photosynthesis and water loss through transpiration.
  • High humidity reduces transpiration by decreasing the concentration gradient for water vapor diffusion from the leaf.
  • Plants have adaptations to control water loss, such as closing stomata and having specific structural features.
  • Cacti have adaptations like no leaves, photosynthesizing stems, and a small surface area to volume ratio to minimize water loss.
  • Marram grass has rolled leaves and pitted stomata to reduce the surface area for evaporation, thus lowering transpiration rates.
  • Adaptations in plants to minimize water loss include fat stems, lack of leaves, and rolled leaves.

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