B4 Transpiration

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education Mind Map on B4 Transpiration, created by A Raza on 06/09/2020.
A Raza
Mind Map by A Raza, updated more than 1 year ago
A Raza
Created by A Raza over 2 years ago
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B4 Transpiration
  1. What is transpiration? (this is from your EOY exam!)
    1. Stomata
      1. Why are stomata necessary in a leaf?
        1. How are stomata opened and closed?
          1. By what process is water lost through the stomata?
            1. The number of stomata per mm2 on a leaf were counted to be 250, 280, 265, 245, 270, 255 and 290. Calculate the mean number of stomata to 3 significant figures.
            2. Investigating the rate of transpiration
              1. What is the function of the reservoir?
                1. How do you measure the rate of transpiration using a potometer?
                2. Factors that affect transpiration
                  1. If temperature is increased, how does this affect the rate of transpiration?
                    1. Explain why? Think about the rate of evaporation!
                    2. If humidity is increased, how does this affect the rate of transpiration?
                      1. Explain why? Think about the concentration gradient of water molcules inside and outside of the leaf
                      2. If light intensity is increased, how does this affect the rate of transpiration?
                        1. Explain why? Think about the rate of photosynthesis!
                        2. If wind speed is increased, how does this affect the rate of transpiration?
                          1. Explain why? Think about the rate of evaporation and the conctrnation gradient of water in and out of the leaf if water vapour is blown away quickly!
                        3. Minimising water loss
                          1. How does a waxy layer on the top of the leaf reduce water loss?
                            1. How does having most stomata on the underside of the leaf minimise water loss?
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