A student plans to investigate the effect of light intensity on transpiration in plants - HSC - SSCE Biology - Question 23 - 2018 - Paper 1
Question 23
A student plans to investigate the effect of light intensity on transpiration in plants.
Complete the table, identifying features that this student should include to... show full transcript
Worked Solution & Example Answer:A student plans to investigate the effect of light intensity on transpiration in plants - HSC - SSCE Biology - Question 23 - 2018 - Paper 1
Step 1
Dependent variable.
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Answer
The dependent variable in this experiment is the amount of water lost, which can be measured by quantifying the water uptake or weight loss of the plant.
Step 2
Control.
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The control for this experiment would involve keeping the plant in the dark to ensure that the only variable affecting transpiration is the light intensity.
Step 3
Variables to be kept constant.
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Type of plant: The same species or variety of plant should be used throughout the experiment to maintain consistency.
Temperature: The temperature should be kept constant as it can influence the rate of transpiration.
Step 4
Explain ONE mechanism for the movement of materials in xylem vessels.
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Water molecules are cohesive. As water molecules evaporate from the leaves, the next molecules are pulled up the xylem vessel. This process, known as transpiration pull, is one of the mechanisms that drives the movement of water from roots to leaves.
