Tuesday, March 22, 2011

2.55 Rate of Transpiration




- Transpiration is the loss of water through the leaf (caused by evaporation and diffusion through stomatal pore) 
- absorption of sunshine generates heat - transforms the water into heat 
- Concentration gradient for Water Vapour 
- if big difference then high rate of transpiration - factors: low humidity, high winds (wind blows away water vapour), high temperature (more evaporation), high light intensity ( higher rates of Photosynthesis) All result in FAST DIFFUSION 
- if small difference then low rate of transpiration - factors: high humidity, low wind speed (water vapour builds up around pore - gradient shallow), low temperature (less evaporation), low light intensity (rate of photosynthesis will be low and slow so water movement will be low and slow) 
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1 comment:

  1. jobuMarch 22, 2011 at 4:59 AM

    thanks for doing all this work so quickly. Can you just check with the list in 2.54 to make sure you are happy with the list of key points in this post.

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