Question

You’ve done a large series of experiments, growing different combinations of crop plants together. Suppose you changed this lab's experimental design. Which of the following changes would probably NOT change the results?


a. Substituting slow-growing lettuces for rutabaga and mustard.
b. Letting the plants grow for twice as long, so some of the "fast-starters" slow down growth and "slow-starters" speed up.
c. Restricting water and/or nutrients, instead of supplying ample quantities of both.
d. Adding leaf-eating caterpillars that prefer rutabaga.
Moving the trays farther apart in the greenhouse, so the edges don't touch one another.

Answer 1

From the options given above, the correct answer is E. All the other options given will affect the final results that will be obtained from the experiment. Moving the trays of the plants farther apart in the green house so that the edges do not touch one another is not going to affect the final results of the experiment in any way whatsoever, for this do not have a direct impact on the growth rates of the plants.