Plant: Experiment and Environmental Variables

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PLANT GROWTH EXPERIMENT

Numerous environmental variables influence plant growth. Three students each planted a seedling of the same genetic variety in the same type of container with equal amounts of soil from the same source. Their goal was to maximize their seedling's growth by manipulating environmental conditions. Their data are shown below.

Plant Seedling Mass (grams) Day 1 Day 30 Student A 4 24
Student B 5 35
Student C 4 64

a) Identify three different environmental variables that could account for differences in the mass of the seedlings at day 30. Then choose one of these variables and design an experiment to test the hypothesis that your variable affects growth of these seedlings.

b) Discuss the results you would expect if your hypothesis is correct. Then provide a physiological explanation for the effect of your variable on plant growth.

Rubric

Standards - Question #3 (1996)#3.

Numerous environmental variables influence plant growth. Three students each planted a seedling of the same genetic variety in the same type of container with equal amounts of soil from the same source. Their goal was to maximize their seedling's growth by manipulating environmental conditions. Their data are shown below.

Plant Seedling Mass (grams)

Day 1 Day 30
Student A 4 24
Student B 5 35
Student C 4 64

a) Identify three different environmental variables that could account for differences in the mass of the seedlings at day 30. Then choose one of these variables and design an experiment to test the...
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