Name: ______
Class: ______Date: ______
Chapter 1: The World of Life Science
Directed Reading
Section: Asking About Life
1. The study of living things is called ______.
IT ALL STARTS WITH A QUESTION
2. The existence of one-celled algae, giant redwood trees, and 40-ton whales illustrates the amazing ______of life.
3. What is one question you could ask about any living thing?
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LIFE SCIENTISTS
4. Who can become a life scientist? ______
5. Where are some of the places that life scientists work?
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6. What determines what a life scientist studies?
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WHY ASK QUESTIONS?
7. Life scientists are learning about ______in order to try to find a cure for this deadly disease.
8. Studying the way humans inherit the code that controls their cells will help scientists learn about diseases such as cystic fibrosis, which may be ______by children from their parents.
9. What is a major cause of many environmental problems?
______
10. Why are scientists studying the food and habitat needs of Siberian tigers?
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Section: Scientific Methods
WHAT ARE SCIENTIFIC METHODS?
1. The first step is using scientific methods is asking questions. Name two steps that follow.
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2. Why do scientists vary the order of the steps of scientific methods?
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ASK A QUESTION
______3. Observations are useful only if they are
a. important.
b. accurate.
c. complicated.
d. understood.
FORM A HYPOTHESIS
4. A possible explanation or answer to a question is a(n) ______.
5. A hypothesis must be ______in order to be useful.
6. A statement of cause and effect that can be used to set up a test for a hypothesis is called a(n) ______.
TEST THE HYPOTHESIS
7. What is a controlled experiment?
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8. What is a variable?
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9. Designing an experiment requires ______.
10. Why do scientists try to test many individuals?
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ANALYZE THE RESULTS
11. How might a scientist organize data in order to analyze them?
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DRAW CONCLUSIONS
12. Which is more helpful: proving a hypothesis wrong or supporting a hypothesis? Why?
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13. Finding an answer to a question often leads to ______.
COMMUNICATE RESULTS
14. What are two reasons that scientists share their results?
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Section: Scientific Models
TYPES OF SCIENTIFIC MODELS
_____1. What is a representation of an object or a system called?
a. the real thingc. a model
b. a structured. a prediction
_____2. Which is an example of a physical model?
a. an equationc. a toy rocket
b. a microscoped. human bones
_____3. A Punnett square is an example of
a. a physical model. c. a conceptual model.
b. a mathematical model.d. a representation of an object.
_____4. Which of the following is a conceptual model?
- the idea that life originated from chemicals
- a model human skeleton
- x+2 = 7
- a plastic human heart
BENEFITS OF MODELS
_____5. Models can be used to represent things that are
a. very small.c. very complicated.
b. very large.d. all of the above.
BUILDING SCIENTIFIC KNOWLEDGE
6. An explanation that ties together many hypotheses and observations is called a(n) ______.
7. A scientific idea that rarely changes is a scientific ______.
8. What is the difference between scientific theory and scientific law?
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9. New scientific ideas take time to develop into ______or to become accepted as ______or ______.
Section: Tools, Measurement, and Safety
1. What do life scientists use tools for?
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COMPUTERS AND TECHNOLOGY
2. What is technology?
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3. When was the first electronic computer built? ______
4. How do scientists use computers?
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TOOLS FOR SEEING
Directions: Match the correct description with the correct term. Writhe the letter in the space provided.
_____5. bounces electrons off the surface of a specimen to produce a three-dimensional image_____6. passes electrons through a specimen to produce a flat image
_____7. made up of three main parts: a tube with lenses, a stage, and a light
_____8. sends electromagnetic waves through the body to create images / a. magnetic resonance imaging
b. scanning electron microscope
c. compound light microscope
d. transmission electron microscope
MEASUREMNT
_____9. Many standardized units of measurement were once based on
a. the weather.c. parts of the body.
b. mythology. d. ancient worldwide standards.
10. What are two advantages of using the International System of Units?
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11. What unit of measurement would a life scientist use to describe the length of an ant? ______
12. A measure of the surface of an object or region is its ______.
13. The units for area are called ______units.
14. What is the term used to describe the amount of space something takes up or the amount of space it contains? ______
15. What SI units of measurement are used to determine the volume of liquids and solids?
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16. A measure of the amount of matter of an object is its ______.
17. What units of measurement are used to describe the amount of matter, or mass, in an object? ______
18. The measurement of how hot or cold something is, and an indication of how much energy it contains, is its ______.
19. What are three different units for measuring temperature?
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SAFETY RULES!
20. What are two examples of safety precautions you should follow before beginning an experiment?
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Directions: Match the symbol with the appropriate label, and write the corresponding letter in the space provided.
_____21. hand safety_____22. sharp object
_____23. clothing protection
_____24. chemical safety
_____25. eye protection
_____26. electric safety
_____27. plant safety
_____28. heating safety
_____29. animal safety / a.
b.
c.
d.
e.
f.
g.
h.
i.
Chapter 1: The World of Life Science1