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Leaves were collected from the plant of a certain species growing in a shaded site and a plant from the same species growing in an open site. The surface area of each leaf was worked out. The results obtained are shown in the table below.

             Surface area of leaves (cm3)  
 Shaded site Open site 
 21
 14
 16
 18
 19
 21
 19
 22
 18
 16
 13
 22
 21
 23
 19
 18
 15
 15
 17
 18
 17
 17
 19
 13
 14
 21
 13
 16
 13
 16
 12
 14
 22
 20
 Mean surface area = x1  Mean surface area = x2
  1. Calculate the mean score x1 and x2 
  2. Suggest one reason for the differences in the mean surface areas between the leaves from the two sites. Explain your answer. 

1 Answer

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  1. X1sum of all surface areas = 18.53cm2
                           17
    X2 – Sum of all surface areas =15.71cm2
                           17
  2. the amount of light the leaves receive;
    • leave in shaded areas have larger surface areas to trap light of low intensity;
    • Leaves in open sites have smaller surface areas as light is of high intensity 

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