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BIOL202 - Study Guide - LAB FINAL practice answers

BIOL202 - Study Guide - LAB FINAL practice answers -...

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ANSWERS TO THE LAB FINAL PRACTICE QUESTIONS Note: If you spot any errors below, please alert dr j immediately . 1.) Area of each plot = 20m * 20m = 400m 2 Mean number of crabs per plot = 12 + 8 + 4 + 11 + 6 + 2 = 43 = 7.17 6 6 7.17 = x 7.17 * 100 = 400x 400m 2 100m 2 717 = 400x x = 717/400 x = 1.79 crabs per 100m 2 2.) Area of quadrat = π r 2 = 3.1416 * 25 2 = 3.1416 * 625 = 1,963.5 m 2 So, if you have 5.6 flowers per 1963.5 m 2 , how do you determine the number of flowers per 1 hectare, or 10000 m 2 ? 5.6 = x 5.6 * 10000 = 1963.5x 1963.5 m 10000 m x = 56000/1963.5 x = 28.52 flowers per hectare 3 a.) Always, always, always convert crazy American measurements in to sane metric measurements first! 24 in. * 2.54cm/in. = 60.96cm = 0.6056m 12 in. * 2.54cm/in. = 30.48cm = 0.3048m Metric area of quadrat = = 0.6096m * 0.3048m = 0.185m 2 3b.) Mean = 23 + 41 + 67 + 4 + 68 + 13 = 216 = 36 caddisflies per quadrat 6 6 3c.) 36 caddisflies = x 0.185m 2 1m 2 x = 36/0.185 x = 194.6 caddisflies per m 2 3d.) The stream is essentially one big long skinny rectangle. 1 km = 1000m thus the area of the stream = 3m * 1km = 3m * 1000m = 3000m 2 Caddisflies per 3000m 2 = 194.6 caddisflies per m 2 * 3000m 2 = 583800 caddisflies
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4 a.) 10 cucumbers = x 45x = 10 * 100 45m 2 100m 2 45x = 1000 x = 22.2 sea cucumbers per 100m 2 4b.) The park is 7853 hectares. One approach is to first figure out how many sea cucumbers per hectare and then multiply by 7853.
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