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Transpiration regulates how much water moves through the plant. In hot dry air, more water will evaporate out of the stomates resulting in a higher transpiration rate. Light, or temperature, can therefore increase transpiration. Wind will evaporate more water from the leaf's boundary layer resulting in a higher transpiration rate. Humidity or moisture will lower transpiration because less water will evaporate out of the stomates.
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How did each condition room fan light and mist affect the gradient of water potential from stem to leaf in the experimental plant?
Under the humid condition the rate of transpiration decreased, this is due to the fact that the water potential of the air surrounding the leaf was increased by the mist, this in turn minimized the gradient of water potential between the leaf and its surrounding environment, thus the process of transpiration lessened to some extent. This occurred because the rate of transpiration decreases proportionally to the amount of humidity in the air. Under windy conditions the rate of transpiration showed an increase, this is due to the fact that wind removes water vapor from the leaf's surrounding, resulting in a broader concentration difference between the leaf and its outer environment, therefore the leaf possessed a higher water potential as compared to its outside environment, and a more rapid loss of water occurred through the stomata.
One example about Osmosis in the real world?
osmosis is the diffusion of water When a fresh water plant is in the ocean (salt water) then the ocean will be hypertonic and water will rush out with the concentration gradient to try and reach an equal balance.
What is the dependent variable in a science experiment?
The dependent variable is the effect of an independent variable. For example, if a science experiment is done with plant growth under a certain amount of light, the height of the plant is the dependent variable because it depends on the amount of light.
Can a tomato plant survive in an oxygen chamber with a light source?
For a time yes but as it is a plant and therefore a producer it will eventually die because it will not be able to make any food as there is no CO2 in the air.
How would you differentiate independent variables from dependent variables?
The independent variable is the variable that you are curious about, and that you are going to change is some systematic way in an experiment to see what affect your changes make. What you check, to see if there are differences, is the dependent variable. According to your hypothesis, the values of the dependent variable will 'depend' on how you manipulate the independent variable. You want to know the effect of growing plants under different colors of light. You want to know how different colors of light (the variable you will manipulate) will affect plant growth (the dependent variable). You will want to use several controls, too. For example, if you try the above but you use several different kinds of plant, of different ages, in different soils and temperatures and different amounts of water, and different lengths of exposure to light (some sunlight, some 'full-spectrum lamps', etc) your experiment will be without value, except as a lesson in how not to do it!
