# 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.

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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. 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