Analyzing Data and Drawing Conclusions

Question 7 • RVACR Ecology

In which situation has the independent variable for the experiment been changed?Check all that apply.

Answer

changed from counting the number of duckweed at day 0 and day 14 to counting them every day

changed from testing duckweed growth in beakers to testing duckweed growth in large outdoor tanks

changed from testing the effect of pH on duckweed growth to testing the effect of light levels on duckweed growth

changed from testing the effect of acid pH on duckweed growth to testing the effect of basic pH on duckweed growth

Explanation

The independent variable is the factor deliberately changed to test its effect on duckweed growth. Choice C changes the factor being tested from pH to light level, and choice D changes the pH condition from acidic to basic. Choice A changes how often growth is measured, while choice B changes the setting or equipment; neither changes the experimental factor being tested.

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