Download Science Introduction

7th Grade Life Science
Mr. Fisk
Chapter 2 – Living Things
Engage: How are people classified?
Objectives:
1. Explain why biologists classify organisms.
2. Relate the levels of classification to the
relationships between organisms.
3. List characteristics used to classify organism
into groups, including domains and kingdoms.
2-2 Classifying Organisms
A. Why do Scientists Classify?
 There are more than 1 million species of
organisms identified – still growing.
 Organizing them into groups makes it a
lot easier to study.
 Classification – is the process of
grouping things based on their similarities.
 Taxonomy – scientific study of how living
things are classified.
Introduction
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7th Grade Life Science
Mr. Fisk
B. The Naming System of Linnaeus
1. Binomial nomenclature = “two names”
2. Genus and Species
 Genus – (genera) first word in
scientific name – similar – closely
related organisms. EX. Felis – pumas,
marbled cats, and house cats.

 Species – 2nd word in name – very
similar – can mate with each other and
produce offspring.
Introduction
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7th Grade Life Science
Mr. Fisk
3. Using Binomial Nomenclature
 Latin Words
 Name always in italics. Felis concolor
 Genus capitalized
 Species lower case
 Makes it easier for scientist to
understand EX. Puma, Mt. Lion,
Cougar, all Felis concolor
C. Levels of Classification
1. Understanding levels –
State,town,street,house
2. (8) Major Levels of Classification
 Domains
(Largest)
 Kingdoms
Broad Group
 Phyla (Phylum)
 Classes
 Orders
 Families
 Genera (Genus)
(Smallest)
 Species
More Specific
D Kings Play Cards On Fat Green Stools
Introduction
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7th Grade Life Science
Mr. Fisk
3. Classifying an Owl
 See page 46
 As you move down fewer kinds of
organisms in each group.

Introduction
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7th Grade Life Science
Mr. Fisk
D. Domains & Kingdoms
1. 3 – Domain System
Bacteria
Archaea
Eukarya
 Bacteria – (Prokaryotes)
o Found almost everywhere
o Autotrophs & Heterotrophs
o Prokaryotes – lack a nucleus
o Unicellular
 Archaea – “Ancient”
o Found – vents in the ocean floor,
hot springs, salty water, swamps,
and conditions similar to those of
Ancient Earth.
o Unicellular
o Autotrophs & Heterotrophs
Introduction
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7th Grade Life Science
Mr. Fisk
 Eukarya –
o Eukaryotes – organisms with cells
that contain a nucleus.
o 4 Kingdoms – Protists,Fungi,
Plants, and Animals.
Protists –
o Classified as an animal, plant, or fungus.
o Odds and Ends kingdom
o Autotrophs & Heterotrophs
o Unicellular & Multicellular
o
Introduction
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7th Grade Life Science
Mr. Fisk
Fungi –
o Mushrooms, molds, and mildew
o Most Multicellular
o Yeast – Unicellular
o Heterotrophs
o
Introduction
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7th Grade Life Science
Mr. Fisk
Plants –
o Multicellular
o Autotrophs
o
Introduction
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7th Grade Life Science
Mr. Fisk
Animals –
o Multicellular
o Heterotrophs
o
HW – 2-1 SR Page 40
2-1 R&R
Introduction
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