A student wanted to investigate the effect of varying concentrations of auxin on plant growth. Bean plants were grown in potuing soll in individual pots. Different
amounts of auxin were sprayed daily on plants in different pots. The plants were
grown at room temperature. At the end of one week the plants were examined
As a control the student should have used a pot that
did not contain a plan
was grown ar 37 deseos C
contained a tomato plant
was not sprayed with auxin