TRACE ANY TWO DISTRICTS OF THE STATE ON A GRID PAPER/GRAPH PAPER. COUNT THE TOTAL NUMBER OF SQUARES LIES INSIDE THE BOUNDARIES . TOTAL NUMBER OF SQUARES IS KNOWN AS THE AREA OF THAT PARTICULAR PORTION. AREA OF GRAPH= NO. OF CELLS* AREA OF ONE CELL NOW COMPARE YOUR CALCULATED AREA WITH THE ACTUAL AREA OF THAT REGION
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Below are three examples of one Norway Maple (Acer platanoides) leaf, which has been used to demonstrate the use of grid paper in measuring surface. Each of the examples were hand-drawn onto the grid paper using the same dried, pressed leaf as students would do in class. The first example using 2 cm grid paper shows both basic leaf parts (blade and petiole). The leaf blade is the primary photosynthetic surface and the petiole is the leaf stalk connection to the stem.
In calculating surface area, we traced the maple leaf onto 2 cm, 1.5 cm, 1 cm, and 0.5 cm grid paper. Since the petiole does not contribute much to photosynthesis, it was only drawn once to show the basic plant parts. The petiole was removed from the other drawings. For each calculated surface area, whole squares located within the leaf area drawing were identified first (outlined in red and numbered on the first diagram) and multiplied by the appropriate area of each grid size (e.g., the area for each square using 2 cm grid paper = 4 cm2). Squares which included part of the leaf surface (numbered in black print on the first diagram) were added up then divided by 2 since only part of the surface was included within the square. Note: As the grid size gets smaller, a better estimate of the true leaf surface area is determined. Grid size can be decreased until it becomes too difficult to see the squares. Using different grid sizes is a great lead-in to a discussion of accuracy and precision in surface area measurement.
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