Ch 1 sec 1-4 Flashcards
Technology
The application of science for practical purposes; the use of tools, machines, materials, and processes to meet human needs.
Compound light microscope
An instrument that magnifies small objects so that they can be seen easily by using two or more lenses.
Electron microscope
A microscope that focuses a beam of electrons to magnify objects
Volume
A measure of the size of a body or region in three-dimensional space
Area
A measure of the size of a surface or a region
Mass
Is a measure of the amount of matter in an object
Temperature
A measure of how hot (or cold) something is
Life science
The study of living things
Scientific methods
A series of steps followed to solve problems
Hypothesis
An explanation that is based on prior scientific research or observations and that can be tested
Controlled experiment
An experiment that tests only one factor at a time by using a comparison of a control group with an experimental group
Variable
A factor that changes in an experiment in order to test a hypothesis
Model
A pattern, plan, representation, or description designed to show the structure or workings of an object, system, or concept
Theory
An explanation that ties together many hypotheses and observations
Law
A summary of many experimental results and observations; a law tells how things work
Use life science and scientific method in a sentence
Life scientists use life science to develop scientific methods
Use the following terms in a sentence: controlled experiment and variable
There are not a lot of variables in controlled experiments.
How does a theory differ from a hypothesis?
A theory is a wide range of explanations and a hypothesis is a prediction
Compare a compound light microscope from an electron microscope?
A compound light microscope can magnify objects with two lenses so it can be seen easily. Vs an electron microscope can focus on a beam of electrons to magnify objects
Compare area to volume, how do they differ?
Area is length times width of a polygon. Volume is a 3 dimensional measurement
The steps of scientific methods often start with __ _____________.
A question
A control group is compared with one or more experimental groups with what type of experiment?
Controlled
What is the best tool for measuring 100mL of water?
150 mL graduated cylinder
Which of the following is NOT an SI unit?
1) meter
2) foot
3) liter
4) kilogram
Foot
A pencil is 14cm long. How many millimeters would that be?
140mm
List three ways that science is beneficial to living things?
1) science can be used to find cures for diseases
2) to understand d animal behavior
3) solve environmental problems
Why do hypotheses need to be testable?
In order to be useful
Give an example of how a life scientist might use computers and technology.
A life scientist studying animals might use a radio collar
List 3 types of models, and give an example of each.
1) Physical-model of a cell
2) mathematical- Punnett square
3) conceptual- Big Bang theory
What are some advantages and limitations of models?
Easier to see and manipulate, but it can’t work like the real thing
Which SI units can be used to describe the volume of an object? Which SI units can be used to describe the mass of an object?
Volume equals liters
Mass equals grams; and kilograms
In a controlled experiment, why should there be several individuals in the control group and in each of the experimental groups?
So they can help each other if they don’t understand. More individuals in the room the more confident they could be.
Investigations often begin with observation. What limits are there to the observations that scientists can make?
Observations are limited to human senses and technology
