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:
Identify the hypothesis:Cattails are grown more efficiently in higher amounts of water.
Identify the independent variable:Amount of water given to cattails.
Identify the dependent variable:Growth of cattails in 30 days.
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
Identify the control group in this experiment:No control group (The scientist should add 25 cattails and place in a swamp.)
Identify the experimental group(s):The water given to cattails
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.
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.
* One group should be in a swamp area because that is the cattails habitat.
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:
Complete each of the following:
- Identify the hypothesis:Cattails are grown more efficiently in higher amounts of water.
- Identify the independent variable:Amount of water given to cattails.
- Identify the dependent variable:Growth of cattails in 30 days.
- 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
- Identify the control group in this experiment:No control group (The scientist should add 25 cattails and place in a swamp.)
- Identify the experimental group(s):The water given to cattails
- 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.
- 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.
* One group should be in a swamp area because that is the cattails habitat.