Question

n experimental design would best determine the effect of low temperatures on the growth of bean plants? measure the rate of growth in 20 bean plants of the same species, each grown at the same low temperature measure the rate of growth in 20 bean plants of the different species, each grown at a different low tempera measure the rate of growth in 20 bean plants of the different species, each grown at the same low tempera measure the rate of growth in 20 bean plants of the same species, each grown at a different low temperatur

Explanation:

To determine the effect of low - temperatures on bean plant growth, we need to keep the plant species constant and vary the low - temperature factor. Measuring the growth rate of 20 bean plants of the same species at different low - temperatures allows us to isolate the effect of temperature on growth. If we use different species, other factors related to species differences could confound the results.

Answer:

Measure the rate of growth in 20 bean plants of the same species, each grown at a different low temperature.