Poison ivy is a weed that grows in New York State. It synthesizes an oil, urushiol, that causes skin rashes. Researchers have found that if poison ivy grows in an environment that

contains an increased concentration of carbon dioxide, the plants grow larger, faster, and

produce more urushiol. Because carbon dioxide levels in the atmosphere are rising, poison

ivy might become a hazard to people who work or vacation outdoors.

In order to verify this research, experiments must be carried out. Design an experiment to test whether

poison ivy is affected by air containing higher than normal concentrations of carbon dioxide. In your

answer, be sure to:

• state the hypothesis the experiment would test [1]

• state one way the control group should be treated differently from the experimental group [1]

identify two conditions that should be kept the same in both the control and the experimental groups [1]

describe the

typ