NAME ________________________________ HOUR______
For 3 DIFFERENT leaves get a stomate count under high power magnification. Record your counts
for 3 different fields of view (FOV) and get an average count for each leaf. Calculate the High power
field of view (FOV) and use that to determine the area (in mm2) under high power. Calculate the
average stomates per mm2.
Stomata Count on High Power
Leaf
FOV 1
FOV 2
FOV 3
Average
Count
Area of High
Power FOV
(mm2)
Average Stomates
/ mm2
1
2
3
Diameter of High Power FOV (mm) = Diameter in Low Power X Magnification of Low Power Objective
Magnification of High Power Objective
Area of a Circle =
𝛑r2
1.
Which leaf had the highest number of stomates per mm2?
2.
What does it mean, in respect to photosynthetic rates, when a plant has more stomates per
leaf area?
3.
What time of day would you expect the stomates to be closed or almost closed and why?
4.
How would a drought affect the opening or closing of stomates?