Scenario+7+pd+7

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: * One group should be in a swamp area because that is the cattails habitat.
 * 1) Identify the hypothesis: Cattails are grown more efficiently in higher amounts of water.
 * 2) Identify the independent variable: Amount of water given to cattails.
 * 3) Identify the dependent variable: Growth of cattails in 30 days.
 * 4) Identify the other variables the scientist needs to consider/control during this experiment: Space between each cattail, same type of cattail species, environment the cattails are in, same amount of fertilizer
 * 5) Identify the control group in this experiment: No control group (The scientist should add 25 cattails and place in a swamp.)
 * 6) Identify the experimental group(s): The water given to cattails
 * 7) What conclusions might be drawn from this data? Cattails grew best in group 1, showing that the more water the more efficiently the cattails grow.
 * 8) What recommendations might you suggest for further study or for improvement? Keep one group in a *swamp area and measure the average growth after 30 days.