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# Investigating Variation in Leaf Size

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Introduction

Investigating Variation in Leaf Size Aim: How much variation will we observe between species in terms of leaf area? How will this compare with variation within species (or between leaves of the same individual)? Description: The leaves of plants are adapted to maximize photosynthesis. They are also adapted to water availability and humidity. The size, shape and number of leaves on a given plant will reflect the conditions of its native habitat. Method: - Firstly, form a group of two to three people - Then go outside into the garden area and collect a pair of four different types of leaves. Try to collect a variation in leaf size. - After that place the leaves on a piece of squared paper (4mm�) ...read more.

Middle

- Then using a ruler measure the length of each leaf but try to make it a fair test by either including or not including the small stem of each leaf. Make sure that the measurements of length are all calculated in mm�. - After that calculate the standard deviation of the area and then do the same for the length. Kettern 2 Data Collection: Type of Leaf Area (mm�) Length (mm�) Leaf 1 Leaf 2 Mean Leaf 1 Leaf 2 Mean A 528 900 714 67 93 80 B 412 372 392 29 31 30 C 500 616 558 50 51 50.5 D 742 676 709 53 50 51.5 Measures of Variation (Range): Type of Leaf Area (mm�) ...read more.

Conclusion

Evaluation: One of the limitations of this investigation was the sample size because more leaves per plant would have been needed in order to construct a fair test and collect accurate results. Another limitation was that the sampling time was limited due to the weather. The improvements that need to be made to this investigation are an increase in sample size, recording of leaf position on the plant, recording of plant position and identifying the plant species. The extensions that could be made to this investigation are investigating the growing location verse the leaf area, comparing the climate to the leaf area and contrasting the leaf number verse the leaf area. ...read more.

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