Topics

• CER• Graphing

• X, Y axes• Intervals labels

• Experiments• Variables

• Controlled/constants• Independent/dependent

• Control groups vs ex. Grps• Qualitative vs quantitative data (bio)

Test TomorrowPS ISN due (labs)PS read ch 2BIO read ch 6

• Hypothesis• Null hypothesis (bio)

• Observations/inferences (bio)• Microscopy (bio lab)• SI Units

• Metric conversions• 8 characteristics of life (bio)

Unit 1 Review

Characteristics of Life

• It breathes. Is that one of the characteristics of life?

Does wine breathe? Do fungi breathe?

Characteristics of Life

• It breathes. Is that one of the characteristics of life? NO

Characteristics of Life

• Name four characteristics of living things.

1. Made of cells2. Reproduces3. Grows and develops4. Displays organization5. Adapts and evolves6. Responds to stimuli7. Maintains homeostasis8. Requires energy

CER Model: Claims

• State a valid hypothesis

CER Model: Claims• State a valid hypothesis: As rainfall increases the number of

zebra babies born will increase

CER Model: Experimentation

• Identify the dependent variable

CER Model: Experimentation

• Identify the dependent variable: zebra babies born

CER Model: Experimentation

• Identify a controlled variable

CER Model: Experimentation

• Identify a controlled variable: time of year (spring)

CER Model: Experimentation

• What is the label that would go on the Y axis?

CER Model: Experimentation

• What is the label that would go on the Y axis? Zebra babies born

CER Model: Claims

• State a valid hypothesis

CER Model: Claims• State a valid hypothesis: If the amount of nitrogen is

increased, then corn production will increase (the amount of corn produced will increase)

CER Model: Evidence

• Identify the independent variable

CER Model: Evidence

• Identify the independent variable: amt of nitrogen

CER Model: Evidence

• Identify a controlled variable.

CER Model: Evidence

• Identify a controlled variable: type of soil, amount of sunlight

CER Model: Evidence

• What goes on the X and Y axes?

CER Model: Evidence

• What goes on the X and Y axes? X= amt nitrogen, y = amt corn produced

CER Model: Experimentation

CER Model: Experimentation

Meter stick

CER Model: Experimentation

• Identify what will go on the Y axis when the data is graphed?

CER Model: Experimentation

• Identify what will go on the Y axis when the data is graphed? Height of the plants

CER Model: Experimentation

• Is this data qualitative or quantitative?

CER Model: Experimentation

• Is this data qualitative or quantitative? quantitative

Scientific Method

Scientific Method

H

Scientific Method

• To be a better experiment, Jose needs a control group. A good control group for this experiment which is looking at the activity of an enzyme involved in the human digestive system would be a test tube with egg and pepsin at what temperature?

Scientific Method

• To be a better experiment, Jose needs a control group. A good control group for this experiment which is looking at the activity of an enzyme involved in the human digestive system would be a test tube with egg and pepsin at what temperature? A test tube at body temperature

Scientific Method

• What is the null hypothesis for this experiment?

Scientific Method

• What is the null hypothesis for this experiment? There will be no effect of temperature change on enzyme activity. (If I change the temperature, then there is no effect on enzyme activity)

CER Model: Experimentation

Anita is studying the factors that affect seed growth. She wants to test whether soaking seeds in water affects the sprouting process.

Which should Anita measure to get the most useful results?

A growth of 100 soaked seeds at a given temperatureB growth of 100 regular seeds at different temperaturesC growth of 50 soaked and 50 regular seeds at a given temperatureD growth of 50 soaked and 50 regular seeds at different temperatures

CER Model: Experimentation

Anita is studying the factors that affect seed growth. She wants to test whether soaking seeds in water affects the sprouting process.

Which should Anita measure to get the most useful results?

A growth of 100 soaked seeds at a given temperatureB growth of 100 regular seeds at different temperaturesC growth of 50 soaked and 50 regular seeds at a given temperatureD growth of 50 soaked and 50 regular seeds at different temperatures

CER Model: Experimentation

• Identify the dependent variable

Anita is studying the factors that affect seed growth. She wants to test whether soaking seeds in water affects the sprouting process.

CER Model: Experimentation

• Identify the dependent variable: seed growth

Anita is studying the factors that affect seed growth. She wants to test whether soaking seeds in water affects the sprouting process.

CER Model: Claim

• What is a possible hypothesis for her experiment?

Anita is studying the factors that affect seed growth. She wants to test whether soaking seeds in water affects the sprouting process.

CER Model: Claim

• What is a possible hypothesis for her experiment? If the seeds are soaked in water then the sprouting process will occur faster

Anita is studying the factors that affect seed growth. She wants to test whether soaking seeds in water affects the sprouting process.

CER Model: Claim

• What is the null hypothesis for her experiment?

Anita is studying the factors that affect seed growth. She wants to test whether soaking seeds in water affects the sprouting process.

CER Model: Claim

• What is the null hypothesis for her experiment? If the seeds are soaked in water there will be NO affect on the sprouting process

Anita is studying the factors that affect seed growth. She wants to test whether soaking seeds in water affects the sprouting process.

CER Model: Experimentation

• Identify the control group.

Anita is studying the factors that affect seed growth. She wants to test whether soaking seeds in water affects the sprouting process. She plants 50 seeds in soaked in water in Container 1 and 50 normal seeds in Container 2. She puts both pots in a window and fertilizes and waters both pots once a week.

CER Model: Experimentation

• Identify the control group. Container 2.

Anita is studying the factors that affect seed growth. She wants to test whether soaking seeds in water affects the sprouting process. She plants 50 seeds in soaked in water in Container 1 and 50 normal seeds in Container 2. She puts both pots in a window and fertilizes and waters both pots once a week.

CER Model: Experimentation

• What would be qualitative data?

Anita is studying the factors that affect seed growth. She wants to test whether soaking seeds in water affects the sprouting process. She plants 50 seeds in soaked in water in Container 1 and 50 normal seeds in Container 2. She puts both pots in a window and fertilizes and waters both pots once a week.

CER Model: Experimentation

• What would be qualitative data? Color of sprouting leaves, shape of leaves etc.

Anita is studying the factors that affect seed growth. She wants to test whether soaking seeds in water affects the sprouting process. She plants 50 seeds in soaked in water in Container 1 and 50 normal seeds in Container 2. She puts both pots in a window and fertilizes and waters both pots once a week.

Wei

ght (

g)

Time (days)

CER Model: Data analysis

• What’s wrong with this graph?

Wei

ght (

g)

Time (days)

CER Model: Data analysis

• What’s wrong with this graph? The intervals on the X axis are not equal.

CER Model: Experimentation

• Identify a controlled variable.

Anita is studying the factors that affect seed growth. She wants to test whether soaking seeds in water affects the sprouting process. She plants 50 seeds in soaked in water in Container 1 and 50 normal seeds in Container 2. She puts both pots in a window and fertilizes and waters both pots once a week.

CER Model: Experimentation

• Identify a controlled variable. Amount of soil, amount of sunlight, amount of water added each week, amount of fertilizer etc.

Anita is studying the factors that affect seed growth. She wants to test whether soaking seeds in water affects the sprouting process. She plants 50 seeds in soaked in water in Container 1 and 50 normal seeds in Container 2. She puts both pots in a window and fertilizes and waters both pots once a week.

CER Model: Experimentation

Which of these is the mostappropriate unit of measurementto determine the volume of anadult human’s stomach?

A meterB kilogramC literD kiloliter

CER Model: Experimentation

Which of these is the mostappropriate unit of measurementto determine the volume of anadult human’s stomach?

A meterB kilogramC literD kiloliter

CER Model: Experimentation

• Which is larger? 0.005 Liters or 5 milliliters?

CER Model: Experimentation

• Which is larger? 0.005 Liters or 5 milliliters?They are equal

CER Model

Two species of mice live in the same geographical region, but Species 1 prefers open fields, whereas Species 2 lives in forests. An experiment was conducted in which laboratory born mice of each species were presented with simulated 'fields' and 'forests,‘ to determine if they would prefer the environment in which they normally lived.

Identify the hypothesis (claim):

CER Model

Two species of mice live in the same geographical region, but Species 1 prefers open fields, whereas Species 2 lives in forests. An experiment was conducted in which laboratory born mice of each species were presented with simulated 'fields' and 'forests,‘ to determine if they would prefer the environment in which they normally lived.

Identify the hypothesis (claim): If mice are raised in a laboratory, they will still prefer the habitat most similar to the one that their species is from (originated).

CER Model

Two species of mice live in the same geographical region, but Species 1 prefers open fields, whereas Species 2 lives in forests. An experiment was conducted in which laboratory born mice of each species were presented with simulated 'fields' and 'forests,‘ to determine if they would prefer the environment in which they normally lived. The experiment found that the lab mice preferred the same habitats that their original species did.

Use CER to create an explanation. (Claim, evidence and reasoning).

CER Model

Two species of mice live in the same geographical region, but Species 1 prefers open fields, whereas Species 2 lives in forests. An experiment was conducted in which laboratory born mice of each species were presented with simulated 'fields' and 'forests,‘ to determine if they would prefer the environment in which they normally lived. The experiment found that the lab mice preferred the same habitats that their original species did.

Use CER to create an explanation. (Claim, evidence and reasoning). Mice have a genetic predisposition to prefer a specific habitat type because when laboratory mice were tested, they preferred the habitat most similar to the one that their species was from.