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Many students who study using our platform have reported that a large number of the practice questions here are very similar to those that appear in real exams. View Courses
Many students who study using our platform have reported that a large number of the practice questions here are very similar to those that appear in real exams. View Courses
A student hypothesizes that plants grow faster under blue light than under red light. Which setup best tests this hypothesis?
Correct Answer: B. Two groups of identical plants, one grown under blue light and the other under red light.
This setup isolates light color as the only variable while keeping all other conditions constant, such as soil, water, and temperature. Using genetically identical plants eliminates biological variability. This ensures any difference in growth rate results solely from light color. Blue light enhances vegetative growth (leaves and stems), while red light influences flowering. Comparing identical plants under these lights accurately tests the effect of light wavelength on growth rate.
Why Other Options are Incorrect:
A. Two groups of plants of different species introduces genetic variation that could influence growth independently of light color, invalidating the results.
C. One plant grown under blue light and one kept in darkness tests light versus no light, not blue versus red light, failing to address the hypothesis directly.
D. One plant under blue light and one watered with more fertilizer adds another variable—nutrient difference—making it impossible to determine if light color or fertilizer affected growth.
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