Question

botanists are biologists who specialize in studying plants. what is the best method a botanist could use to study the effect of air pollution on the growth rate of corn plants? measure the height of corn plants on a clear day and again on a day when pollution is high survey farmers for their opinion about the effect of pollution on the growth rate of corn compare the growth rate of corn plants in a polluted area to the growth rate of other types of plants in the area conduct a controlled experiment, exposing some corn plants to pollution and others to clean air

Explanation:

A controlled experiment allows for isolating the variable of air - pollution. By exposing some corn plants to pollution and others to clean air, the botanist can accurately determine the effect of pollution on the growth rate of corn plants. Measuring height on different days may be affected by other factors like time - related growth, surveys are subjective, and comparing with other plant types doesn't isolate the effect on corn plants specifically.

Answer:

conduct a controlled experiment, exposing some corn plants to pollution and others to clean air