Scientists Were Interested in Determining If the Amount of Nicotine

Multiple Choice

Scientists were interested in determining if the amount of nicotine present in tobacco leaves is related to the amount of water received by the plants. In a greenhouse, a total of 120 tobacco plants were selected. During the growing season, 30 plants received the normal amount of water, 30 plants received 75% of the normal amount of water, 30 plants received 50% of the normal amount of water, and 30 plants received 25% of the normal amount of water. At the end of the growing season, one leaf was selected from each plant and the amount of nicotine present was recorded for each. Researchers determined that leaves from tobacco plants receiving the normal amount of water during the growing season had more nicotine than leaves from tobacco plants receiving less water. For this experiment, identify the response and treatment variables.

A) Response: Amount of nicotine in leaf.Treatment: Normal amount of water.
B) Response: Normal amount of water.Treatment: Amount of nicotine in leaf.
C) Response: Amount of nicotine in leaf.Treatment: Amount of water received by the plant.
D) Response: Amount of water received by the plant.Treatment: Amount of nicotine in leaf.