Unit 1 Test Study GuideHonor Biology - Answers

1

• Goggles, apron and gloves

2

• a.) Liter (L)

• b.) second (s)

• c.) meter (m)

• d.) Kilogram (Kg)

3

• 1.) Observe

• 2.) State the problem

• 3.) Form a hypothesis

• 4.) Design and run controlled experiment

• 5.) Collect and analyze data

• 6.) Form conclusion

• 7.) Repeat, repeat, repeat….then report.

4

• An inference is a LOGICAL conclusion based only on observation.• There was NO experiment involved.

• A hypothesis is a prediction statement that drives an experiment.

5

• If…, then... .

• Ex: “If I water my pepper plants with sugar water, then they should grow more because plants need sugar (energy) to undergo cell division.”

6.

• Whatever you came up with…

7.)

• Scientists repeat their experiments:• 1.) to get a larger data set from which to draw conclusions.

• 2.) to ensure errors were not made.

8.)

• Scientists have other scientists review their work:• 1.) to ensure there were no mistakes.

• 2.) to ensure all conclusions are backed up by data.

• 3.) to gain new perspectives on the problem.

• 4,) to ensure the research is not done in secrecy (science is for the people).

9.

• Both deal with data.

• Accuracy deals with being “on-target”. Getting what you are “supposed to get”.

• Precision deals with how close the data points are to each other. You can be precise without being accurate.

9 continued…

• With measurements, the more decimal places you measure, the more precise the measurement will be. • Rounding causes errors in precision.

• “2.9” is less precise than “2.93”

10

High accuracy, but low precision

High precision, but low accuracy.

11.)

• Graduated cylinder

12.)

• The meniscus is a curved appearance of a liquid when in a graduated cylinder.

• What is the proper volume of this solution?• A.) 20ml

• B.) 24ml

• C.) 22ml

• D.) 21.5ml

13

• volume

14

• Qualitative data DOES NOT involve measurements.

• Quantitative data DOES involve measurements

15

• Quantitative Data:• The cell increased in mass by 2.3 grams.

• The length of the earthworm is 24.6cm

• The average height of the males in the 9th grade class is 5’6”.

16

• Qualitative:• The seeds colors are green, yellow and white.

• Jim wears jersey #34

• The room feels hot today.

17.)

• The IV is the “new” thing given to a group.• It is the variable you are testing.

• The DV is the measurement you take as a result of the IV.• It is what you analyze to determine if the IV had any effect.

• It responds to the IV

18.)

• IV = Manipulated variable

19

• DV = Responding variable

20

• The control group is the group that does not receive the IV.

• It is the “normal” situation you compare the experimental groups to.

• Without the control, you will not know HOW SIGNIFICANT your DV measurements are.

21.

• 525m 52500. cm

22

• What is larger, 2.5Km or 25000cm?

• 2.5km is larger.

• If you convert 2.5km to cm, you get 250000.cm

• 250000 > 25000

23

• Whatever you came up with…

Experimental Analysis Section

A

• If plants grow better in acidic soil, then plant I give vinegar/water mix to should grow more than the plant that just gets water.

• There are other ways to write this…

B

• vinegar

C.)

• Should read “Dependent Variable”

• Plant growth

D.) Constants include but are not limited to…

• Same size pots, • same amount of water, • same location, • same amount of sunlight, • same length of experiment, • same number of measurements, • same initial height of plants, • Same type of plant• Same type of soil• Same amount of soil in the pots.

E.) Control group

• Is the potted plant that just gets regular water.

F.)

• The experimental group is the potted plant that gets watered with the water/vinegar mix.

Questions? Concerns? Comments?

• Fire away…