Scenario+5

Cattails

A scientist noticed that cattails grew only in swampy parts of his backyard. He decided to try to find out why. He went to the library and found out the following facts: cattails are not found in deserts, cattails are usually found in many swamps, cattails sometimes grow in rivers and streams. The scientist thought for while, then said "I think I have figured out the answer. Cattails need a lot of water to grow." He then went into his year and dug up 100 cattails. He divided them into four groups. Each group contained 25 cattails. All of the groups were grown in the same type of soil, they all received the same amount of light, and they were all kept at the same temperature. There was only one difference between the groups. See the chart below to review the data:
 * Group || 1 || 2 || 3 || 4 ||
 * Water || 4 mL || 3 mL || 2 mL || 1 mL ||
 * Average growth after 30 days || 8 cm || 4 cm || 2 cm || 1 cm ||

Complete each of the following:
 * 1) Identify the hypothesis: Cattails that receive more water grow larger than the cattails with less water.
 * 2) Identify the independent variable: The cattails are getting water from the scientist to experiment their growth.
 * 3) Identify the dependent variable: The growth of the cattails based on the water being received.
 * 4) Identify the other variables the scientist needs to consider/control during this experiment: Make sure the cattails are the same age. If they are the same species of each other. The cattails have to be the same color the same size the cattails have to be in good heath. Same length at the beginning, Same length of roots.
 * 5) Identify the control group in this experiment: There is no control group he measured.
 * 6) Identify the experimental group(s): The cattails he is giving water to and measuring.
 * 7) What conclusions might be drawn from this data? That cattails with more water grow larger and that's why they live in the swampy areas.
 * 8) What recommendations might you suggest for further study or for improvement? By keeping 25 more cattails in the swamp behind his house for a control group.