While hiking after school one day, you came across several plants that you weren

Question

While hiking after school one day, you came across several plants that you weren't familiar with. You took a leaf sample from each, and went back to the lab and did a stomata density count. Using a 40x objective with a field diameter of 0.5 mm, you got the following counts: Sample 1: you counted 30 stomata Sample 2: you counted 4 stomata Calculate the stomata density for each of your samples. Select all that apply from the answer choices Sample 2- stomata density of 333 per mm2 Sample 2 - stomata density of 238 per mm2 Sample 1-stomata density of 41 per mm2 Sample 2 - stomata density of 20 per mm2 Sample 1 -stomata density of 48 per mm Sample 2 - stomata density of 214 per mm2 Sample 1- stomata density of 153 per mm2 Sample 1-stomata density of 32 per mm 2

Explanation / Answer

Stomatal Density = average number of stomata/area of microscopic view

Observed field diameter = 0.5 mm

Radius = diameter/2

                = 0.5/2 = 0.25

Field of view = r2 = 3.14X (0.25)2

                                = 3.14 X 0.0625

                                = 0.196 mm2

For sample 1 the stomata count is 30

So the density would be = 30/0.196

                                                = 153/mm2

For sample 2 the stomata count is 4

So the density would be = 4/0.196

                                                = 20/mm2

sample 1 = 153 and sample 2 = 20

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