exceed the average range of percent of mass lost, calculated using the standard deviation. Period 1’splant exposed to more wind lost a total of 2.175% of its mass through each leaf, while Period 5’s lost 2.123%. The normal/average range of the control plants is 1.3005%-1.8129%. Since both Period 1 and Period 5’s plants have lost more mass per leaf than the average range of the mass lost per leaf of the control, wind resulted in the greatest rate of water loss. Even though some other plants exposed to different variables did have a greater percent of mass lost than the control, that result was not consistent within all periods and therefore omitted from the conclusion of which variable resulted in the greatest rate of water loss through transpiration. Wind results in more transpiration since it decreases the water concentration near the leaves of the plants. In order to reach equilibrium, the plant transpires more since it has more water than the environment outside and water moves from high to low concentration. Some challenges in performing the experiment were tying the rubber band around the stem of the plant without breaking the band and ensuring that all or most of the water sprayed into the bag to cover the plant would remain in the bag, not dripping out. Some errors include allowing that
water to drip out of the bag, not consistently maintaining the same humidity level in the bag for the plant, and not measuring the mass of the plant at exactly 24 hour intervals. Incorrect assumptions were made for the effect of heat, vaseline on tops of leaves, and half the leaves removed. Next time the experiment is conducted, some errors should be resolved, such as finding another way to retain all or most of the water within the bag covering the plant. The mass should also be recorded after 72hours.Future areas of investigation include how the transpiration rate would differ if different types of plants other than periwinkle were exposed to the same variables, how the transpiration rate differs in different plants that are under the same conditions, and how the transpiration rate would be affected if exposed to a colder environment. References Urry, Lisa, et al. Campbell Biology in Focus. Pearson, 2014. Accessed 25 September 2016.
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