Chapter 1 Biology

Which statement best describes a hypothesis? Choose 1 answer:

A hypothesis is a possible, testable explanation for a scientific question.

I decide to grow bean sprouts in my kitchen, near the window. I put bean seeds in a pot with soil, set them on the windowsill, and wait for them to sprout. However, after several weeks, I have no sprouts. What is the hypothesis

I hypothesize that they didn't sprout due to lack of water.

Student TestedResting Pulse RatePulse Rate after Exercise Amrit70 97 Riya 74 106 Maria 83 120L evi 60 91 Max 78 122. Group Average 73 107 Which procedure would increase the validity of the conclusions from this experiment?

Increasing the number of times the activity is repeated

What are the 5 steps to the scientific method

Make an observation. Ask a question. Form a hypothesis, or testable explanation. Make a prediction based on the hypothesis. Test the prediction.

Poison ivy is a weed that produces an oil which causes skin rashes. Scientists want to perform an experiment to see if poison ivy grows taller when exposed to more carbon dioxide. How should the control group in this experiment be treated?

The control group should have plants growing at normal carbon dioxide level. Scientists would grow plants at a normal carbon dioxide level to see if increasing carbon dioxide has an effect on the experimental group

Hypothesis

a testable explanation that addresses the question.

Controlled experiment case study: /carbon dioxide and coral bleaching. the dependent variable

amount of coral bleaching

the group that does not receive the treatment (here, the dry pot) is called the

control group

in an experiment the response that's responds to the treatment is the

dependent variable

The group that receives the treatment in an experiment (here, the watered pot) is called the

experimental group,

Alysha wants to test the effect of different materials on the melting rate of ice. She finds the initial mass of four pieces of ice. She then covers three pieces with either tinfoil, plastic wrap, or paper. The fourth piece is left uncovered. After 30 minutes, Alysha calculates the final mass of each piece of ice to determine which melted the fastest. What is the dependent variable in Alysha's experiment?

final mass of the ice

The variable that the experimenter applies or chooses him/herself.

independent variable

Place the steps of the scientific method in the correct order from beginning (top) to end (bottom).

make an observation, ask a question, form a hypothesis , test the hypothesis. refine the research

Controlled experiment case study: CO2 and coral bleaching the independent variable would be

the levels of carbon dioxide available

Alysha wants to test the effect of different materials on the melting rate of ice. She finds the initial mass of four pieces of ice. She then covers three pieces with either tinfoil, plastic wrap, or paper. The fourth piece is left uncovered. After 30 minutes, Alysha calculates the final mass of each piece of ice to determine which melted the fastest. What is the independent variable in Alysha's experiment?

types of coverings used