Transpiration

Exercise on factors that affect transpiration

  1. You are provided with the following information
Temperature (ºC) 10 20 30 40 50 60 70
Rate of transpiration 20 30 40 50 60 70 80

(a)Plot a suitable graph

(b)Describe the relationship between the two shown in the graph

(c)explain the relationship between the two

  1. You are provided with the following information
Stomatal opening (um) 1 2 3 4 5 6 7
Light intensity 4.2 8.5 13 17.2 22 25.2 30
Rate of transpiration 40 63 74 86 94 110 124

(a) Plot a graph to represent the information above

(b) Describe the relationship between

  1. Light intensity and stomatal opening
  2. Rate of transpiration and light intensity

(c)explain the changes shown in the graph

  1. You are provided with the following information
Rate of transpiration cm3/s 20 30 40 50 60 70 80
Relative humidity mm/hg 70 60 50 40 30 20 10
  • Plot a suitable graph to represent the above information
  • Describe the shape of the graph plotted
  • Explain the shape of the graph
  1. The table below shows the rate of transpiration, in wind and another in still air when the stomata were open to varying extends
Size of stomatal opening (um 1 2 3 4 5 6 7
Transpiration rate in wind (mm/min) 40 63 74 86 94 110 124
Transpiration rate in still air (mm/min) 0 6 12 19 19 23 27
  • Draw a graph of transpiration rate against size of stomatal opening
  • What is the difference between rates of transpiration in wind and still air
  • Explain the differences above
  • What is the size of the stomatal opening when the rate of transpiration in still air is 25 mm/min?
  • How does the size of the stomatal opening affect the rate of transpiration in
  • still air
  • wind

 

 

 

 

 

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