chapter 1: the study of life biology mrs. haase. biology study of life biologists explore life at...
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Chapter 1: The Study of Life
Biology
Mrs. Haase
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Biology Study of life Biologists explore life
at levels ranging from the biosphere to the molecules that make up cells.
Biologists recognize that all living things share certain characteristics
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Characteristics of Life1. Have an orderly
structure All living things
made of one or more cells
Cells are the smallest unit capable of all life functions
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Characteristics of Life2. Reproduction
The production of offspring
Species A group of
organisms that can interbreed and produce fertile offspring.
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Characteristics of Life3. Growth and
Development Increase in the
amount of living material and the formation of new structures
DNA directs pattern of growth and development
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Characteristics of Life4. Response to the Environment
Environment includes air, water, weather, temperature other organisms in the area and other factors
Examples? Stimulus and Response
S: Anything in the organism’s internal or external environment that causes it to react
R: A reaction to a stimulus
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Characteristics of LifeResponses to the internal
environment---Homeostasis Maintenance of internal conditions
suitable for survival despite changes in external conditions
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Characteristics of Life Orderly structure Growth and Development Response to the environment Reproduction
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Characteristics of LifeAccomplishing 1-4
requires energy! All energy originates
from the sun Plants convert solar
energy into sugar Animal use/store
energy in own tissues
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Characteristics of Life Adaptation
Any inherited structure, behavior or internal process that promotes the likelihood of an organism’s survival and reproduction.
Evolution Genetic change of a population or species
over time (generations)
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Chapter 1 Section 2
The Methods of Biology
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The Methods of Biology Science explains nature through
Observations Setting up experiments Creating representative models
Scientific Method: the common steps that scientists use to gather information and answer questions.
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Scientific Method Observations Question Hypothesis
Prediction Experiment Data Conclusion Retest Communicate Results
Flashlight failure
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Observation You observe something in the material
world, using your senses or machines which are basically extensions of those senses.
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Question You ask a question about what you observe. State the problem or question.
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Hypothesis An explanation for a question or a problem
that can be formally tested. Based on research
You should be able to give reasons for why you chose your hypothesis
If/then… statement
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Experiment You figure out a way to test whether the hypothesis
is supported through an investigation
Control group– the standard group used for comparison which does NOT receive the experimental treatment.
Experimental group – one variable changed (group that receives the experimental treatment)
The outcome must be measurable (quantifiable).
Record and analyze data.
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Biologists developed a hypothesis regarding mimicry in snakes.
If an animal has certain color patterns, then it will not be preyed upon.
They tested the hypothesis by making artificial snakes and observing how often they were attacked by predators.
Figure 1.20
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Figure 1.21
This is an example of a controlled experiment. Such an experiment is designed to compare an
experimental group with a control group.
Variables
Independent Variable adjusted by the experimenter (what you vary)
Dependent Variable changes in response to the indep. variable what you measure
Constants: variables that remain the same in all groups
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Analyze Results You do the experiment using
the method you came up with and record the results.
Create data tables, graphs to represent data
Perform calculations that will determine what results mean (averages, percentages, totals)
Identify possible sources of errors
Table 1. Percent of total attacks on different colored artificial snakes.
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Draw Conclusions You state whether your
hypothesis was supported or not and try to explain your results.
Table 1. Percent of total attacks on different colored artificial snakes.
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Retest In order to verify the results, experiments
must be retested.
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Communicate Results Share results with science community
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Scientific Theories and Laws
Hypothesis - testable prediction
Theory - explanation of “why”. based on many observations & experimental
results
Scientific Law - prediction of “what” happens in nature.
Theories can explain a law
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Practice
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Worm Behavior Demo Observations/current knowledge about worm behavior Prediction/Hypothesis: Experiment
400 ml soil 125 ml of water 10 worms Pre-determined #/mass of apple peel Cover with paper. One cold, one room temp
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Chapter 1 Section 3
The Nature of Biology
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Kinds of Information Quantitative Information
Numerical data Can be used to make a graph or a table to communicate
data more easily
Qualitative Information Data that can be observed but not measured
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Measuring in the International System
International System of Measurement (SI) Common units:
Length = meters Mass = grams Volume = liters Time = seconds Temperature = kelvin and Celsius
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Variable: A factor in an experiment. Independent variable: The factor that is
different between groups. The topic of interest in an experiment.
On graphs, theindependent variablealways goes on theX-axis.
Derby, S. (2004) Graphs and Graphing PowerPoint Presentation.
Graphing Review
Fig. 1
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Dependent variable: The factor being measured in the experiment.
Almost always numerical On graphs, the
dependent variable isalways on the Y-axis.
Derby, S. (2004) Graphs and Graphing PowerPoint Presentation.
Fig. 1
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Types of Graphs• Two common types of graphs:
– Bar graphs
– Line graphs
0%
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Sco
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Boys Girls
Gender
Biology Test Scores
Absences vs. Scores
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Absences
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Derby, S. (2004) Graphs and Graphing PowerPoint Presentation.
Fig. 2
Fig. 3
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Types of Graphs
Bar graphs are used when the independent variable has categories.
•Boys/girls •Adults/children •Salt water/distilled water /tap water
•Etc.0%
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100%
Sco
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Boys Girls
Gender
Biology Test Scores
Derby, S. (2004) Graphs and Graphing PowerPoint Presentation.
Fig. 2
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Types of Graphs•Line graphs are used when the independent variable has numbers.•Hours of television watched •Age (in years) •Calories eaten per day •Etc.
•Both line graphs and bar graphs show the relationship between independent variables and dependent variables.
Absences vs. Scores
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90
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AbsencesTest
Sco
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Derby, S. (2004) Graphs and Graphing PowerPoint Presentation.
Fig. 3
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Derby, S. (2004) Graphs and Graphing PowerPoint Presentation.
Making a Graph
1) Choose a scale for each axis that includes all values. Number your gridlines evenly.
Fig. 1
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Derby, S. (2004) Graphs and Graphing PowerPoint Presentation.
Making a Graph
2) Label both axes, including units. Fig. 1
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Making a Graph
3) Plot each data point and connect your dots with a line.
Derby, S. (2004) Graphs and Graphing PowerPoint Presentation.
Fig. 1
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Making a Graph
4) Give your graph a descriptive title.
Derby, S. (2004) Graphs and Graphing PowerPoint Presentation.
Fig. 1