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HHS Life Science
Chapter 1
24
Science
7th Grade
10/04/2006

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Term
What is LIFE SCIENCE
Definition
the study of living things
Term
What are three (3) ways life science is benefical to living things
Definition
1 - fighting diseases (polio, AIDS)

2 - understanding inherted diseases

3 - protecting the environment
Term
What is the SCIENTIFIC METHOD
Definition
a series of steps followed to solve problems
Term
What is an OBSERVATION
Definition
any information you gather through your senses
Term
What is a HYPOTHESIS
Definition
an explanation that is based on prior scientific research or oservations
Term
What are the six (6) steps of the scientific method
Definition
1 - ask a question
2 - form a hypothesis
3 - test hypothesis
4 - analyze results
5 - draw conclusions
6 - communicate results
Term
What is a PREDICTION
Definition
a statement of cause and effect that can be used to set up a test for a hypothesis
Term
What is a FACTOR
Definition
anything in an experiment that can influence the experiment's outcome
Term
What is a CONTROLLED EXPERIMENT
Definition
an experiment that tests only one factor at a time by using a comparison of a control group with an experimental group
Term
What is a VARIABLE
Definition
a factor that changes in an experiment in order to test a hypothesis
Term
What are three (3) reasons scientists regularly share their results
Definition
1 - allows others to check results
2 - information can be considered by other scientists with similar interests
3 - can strengthen existing hypotheses or can show new ones are needed
Term
What is a MODEL
Definition
a pattern, plan, representation, or description designed to show the structure or workings of an object, system, or concept
Term
List and describe three (3) types of models
Definition
1 - physical - an actual object (toy rocket, plastic skeleton)
2- mathematical - uses numbers, equations, or other forms of data (punnett square)
3 - conceptual - used to represent systems of ideas (comparisons, ideas)
Term
What is a THEORY
Definition
an scplanation that ties together many hypotheses and observations. They tell WHY things happen.
Term
What is a LAW
Definition
a summary of many experimental results and observations. They tell only WHAT happens.
Term
What is TECHNOLOGY
Definition
the application of science for proctical purposes; the use of tool, machines, materials, and processes to meet human needs
Term
What is a COMPOUND LIGHT MICROSCOPE
Definition
an instrument that magnifies small objects so that they can be easily seen by using 2 or more lenses.
Term
What is an ELECTRON MICROSCOPE
Definition
a microscope that magnifies images by focusing a beam of electrons
Term
What is the INTERNATIONAL SYSTEM OF UNITS
Definition
the global mesurement system also called the SI or metric system
Term
What is AREA
Definition
the measure of the size of a surface or a region, is stated in square units
Term
What is VOLUME
Definition
the measure of the size of a body or region in a 3-dimensional space, is stated in liters for liquids or cubic units for solids (cm3, mm3)
Term
What are two (2) advantages of using the SI SYSTEM
Definition
1 - helps scientists share and compare their observations and results
2 - almost all units are based on units of 10 which makes conversions easy
Term
What is MASS
Definition
the measure of the amount of matter in an object, the basic unit for mass is kilogram (kg)
Term
What is TEMPERATURE
Definition
the measure of how hot or cold something is, celsius is the unit for SI, also can be stated in terms of fahrenheit, and kalvin
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