Chapter 1: The Science of Biology. Key Concept: What is the goal of science?. Standards: I&E: 1a-1g. 1-1: What Is Science?. 1-1. The goal of science is to: investigate and understand the natural world. explain events in the natural world.
Chapter 1: The Science of Biology
What is the goal of science?
Standards: I&E: 1a-1g
1-2 How Scientists Work
These steps are called the Scientific Method.
1. Observe, ask questions.
2. Formulate a hypothesis.
3. Design a controlled experiment.
4. Make careful observations.
5. Analyze and draw conclusions.
This leads to curiosity about something.
A possible explanation for an event or set of observations.
- It is a prediction about the outcome of an experiment.
An "educated guess"
A hypothesis may be ruled out or confirmed.
(hyenas are more closely related to cats)
Experiments must be repeatable!
Next step is to record and analyze results:
If not, hypothesis can be changed.
Most scientific experiments are designed to consider only 1 variable.
Other variables must be controlled. The control variable stays the same, while the manipulated variable changes.
(1 variable only!)
A hypothesis that is supported by many experiments done over a period of time is called a Theory.
Theories are not facts, but probable explanations.
Theories are changeable and expandable, and most importantly, theories are FALSIFIABLE.
(If all exp’ts support hypothesis)
Pill bug, sow bug, roly polies
Phylum Crustacea – related to crabs, shrimp
We want to observe their behavior and see what environment they prefer.
Manipulated variable = ?
Control variables = ?
Hypothesis: If pill bugs prefer moist environments, then they will move to the side of a choice chamber which has more moisture.
(Each lab group picks one)
Objective: to determine _____________________________.
Moist vs. Dry:Moist paper towel, dry paper towel.
Warm vs. Cold:Ice pack for one side, book for other.
Color:Colored paper for each side.
Vinegar vs. Water:drops of vinegar for one side, drops of water for other.
1. Gather choice chamber (CC) and other materials to run expt.
2. cut out paper disk to fit in each side of CC.
3. Count out 10 roly polies.
4. Place 5 roly polies in each side of CC.
5. . . .
10. We will keep __?__, __?__, __?__,
Also tell me what the control variables are!
Table 1. The number of roly polies in each side over time.
Do NOT harm or tease the creatures!
Data from this lab showed that roly polies preferred the ____________ environment over the ___________ environment. I accept/reject my hypothesis that __________________________.
20 points each = 80 points total