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Classification

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Classification I. Classification -the arrangement of things in groups of similar items. -scientists classify living things to describe what they are like and how they ... – PowerPoint PPT presentation

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Title: Classification


1
Classification
2
I. Classification
  • -the arrangement of things in groups of similar
    items.
  • -scientists classify living things to describe
    what they are like and how they are related to
    other organisms.
  • - without classification, scientists could not
    share information about organisms.
  • there is no correct classification system
    for living things.

3
  • An organisms structures and features are
    important characteristics for classification.
  • -ex. Fish are classified by the shape and
    position of their fin.

4
  • B. Scientists use cell structure and ways of
    getting food to place organisms in to kingdoms.
  • C. Dichotomous Key is a powerful tool scientists
    use, always gives two characteristics to choose
    between, each choice leads to another pair of
    characteristics.
  • -ex. tree

5
  • D. Kingdoms
  • -many scientists use six kingdoms today.

6
1. Bacteria separated into two kingdoms,
single-celled organisms, their cell does not
contain a nucleus, they can not be seen without a
microscope. -some of the smallest living
things. - there are more bacteria than any
other organism, and they live almost everywhere
on Earth.
7
  • - Some types of bacteria are very useful.
  • ex. Bacteria in your stomach and intestines
    help you digest food.

8
  • 1. Archaebacteria
  • - meaning ancient bacteria
  • - today they live under conditions that are
    deadly to other living things.
  • -ex. Where there is no oxygen or heat is too
    high to allow most forms of life to survive.

9
  • 2. Eubacteria
  • -generally can not survive in the extreme
    conditions.
  • -ex. Ecoli
  • -only have one cell, but cell functions are
    quite complex.
  • -some use the suns energy to make food, others
    get their food from eating living and non-living
    materials.

10
2. Protists
11
  • -have traits of plants and animals.
  • -have more than one cell, most are
    singled-celled organisms like bacteria.
  • -unlike bacteria they have a nucleus.

12
  • animal-like protists are called protozoa.
  • -take food from their surroundings and move
    through their environment.

13
  • plant-like protists are called algae.
  • - use energy from the sun to make their own
    food.
  • - they produce oxygen just like plants do.
  • - some protists are microscopic, others can
    grow very large.

14
  • - perhaps the curious types of protists are
    those that share characteristics of fungi.
  • they get food from their surroundings.
  • some reproduce through spores as fungi do,
    yet many can move.

15
3. Fungi

16
  • -cells have a nucleus and a complex cell
    structures.
  • range from one-celled organisms to huge
    masses.
  • their cell walls are made of the same
    substance as the hard shells of insects.

17
  • -absorb their food, they decompose, or break
    down, other organisms.
  • -fungi can not move, yet they grow quickly and
    travel far away.
  • -reproduce by spores and they are carried by
    wind.

18
4. Plants
19
  • All plants are multi-cellular.
  • almost all plants make their own food
  • plants are classified according to the way
    they transport water and reproduce.

20
E. Animal
21
  • - Include an amazing variety of creatures.
  • some swim, fly, or walk.

22
II. Ancient Classification Systems
  • A. Aristotle, a Greek philosopher, who developed
    the first classification system, in 350 B.C.

23
  • B. World Explorers
  • - returned from their travels with thousands of
    new plants and animals.
  • - the invention of the microscope led to the
    discovery of tiny forms of life.
  • the number of known living things increased
    greatly.

24
  • C. Carl von Linneus
  • - a Swedish scientist, developed a new
    classification system for organisms in the 1700s.
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