Classification of Organisms & Dichotomous Keys

Slides:

Advertisements

Similar presentations

Taxonomy What’s in a name? 1. Taxonomy  The science of classifying and naming organisms 2.

Advertisements

11/9/11 Q.O.D. How do we organize all the living things in the world?

Classification Notes. Scientists classify organisms based upon similarities.

Categorize organisms below: DogCatCat fish LionWolfApple tree DandelionsLizard SharkMouseDeer.

Classification of Living Things Diversity of Life.

Classification. Why do Scientists Classify? The process of grouping things based on their similarities is classification. Biologists classify so that.

Intro to CLASSIFICATION Classification : A systematic arrangement into classes or groups → Can you name some things that you might classify in your everyday.

Biology Classification. Classification is… The arrangement of organisms into groups or sets on the basis of their similarities and differences. Classification.

.  Classification is the arrangement of organisms into orderly groups based on their physical similarities  Classification is also known as taxonomy.

Key Question. Why are organisms placed into different groups? w Initial Thoughts. w ___________________________________ ______________________________.

Classification. Why do we classify living things? We have over 1.5 million NAMED & classified species. There may be over 30 million species on Earth!!

How Kingdoms are Subdivided Unit A Chapter 2 Lesson 2 Pages A52-A57.

The Classification of Living Things. Classification Unit Definitions Classification – to organize organisms/objects in groups based on similar characteristics.

Taxonomy and Classification. Species 13 billion known species of organisms – Only 5% of all organisms that ever lived – New species are still being found.

Classification. Why Classify? Classification makes it easier to answer questions about living things such as How many known species are there? What are.

Classification of Living Things

Warm Up If I asked you to classify you and your classmates into 2 groups by a distinguishable characteristic, what would you suggest that characteristic.

Chapter 14 : Classification of Organisms

Classification of Living Things

Classification of Living Things

Classification Notes.

Categories of Biological Classification

Biological Classification

Organizing Life’s Diversity

Science Starter Why is the process of classifying living things useful? How might you classify a sunflower, a robin, a lizard, a blue jay, and a tree?

Standard S7L1. Students will identify the diversity of living organisms and how they can be compared scientifically. Students will demonstrate the process.

Taxonomy The science of identifying, classifying, and naming organisms

Grouping organisms based on similarities

CLASSIFICATION.

Taxonomy Classification. Taxonomy Classification.

Classification.

Classification.

Taxonomy (Naming and Grouping).

S7L1. Students will investigate the diversity of living organisms and how they can be compared scientifically.

Taxonomy (Naming and Grouping).

Classification of Living Things

Classification of Living Things

Classification.

Classification.

Classification of Living Things

Taxonomy… Artificial Science at its Best (some times )

Classification of Animals

Classification of Living Things

Taxonomy Biological Classification

Classifying Organisms

Classification.

The science of describing, naming and classifying organisms

Classification of Living Things

CLASSIFICATION The grouping of things according to similar characteristics. TAXONOMY = The study of classification.

Classification of Living Things

Dichotomous Keys Review

Classification of Living Things

Classifying Organisms

CLASSIFICATION.

Understanding Classification Systems

This Powerpoint is a compilation of presentations found on the Internet. Unfortunately, the authors did not include their names on their work.

Taxonomy “science of grouping and naming organisms based on natural relationships”

Classification.

Classification of Living Things

Classification.

What are scientific names? How are organisms classified?

Classification.

Classification.

CLASSIFICATION.

Bell ringer: What did you do for spring break? Be ready to discuss

The diversity of living things

Presentation transcript:

Classification of Organisms & Dichotomous Keys 7th Grade Science

Classification of Organisms Scientists classify organisms to learn more about them Organism--any living thing

Aristotle The Greek philosopher Aristotle was the first person to scientifically classify living things. He classified things as plants or animals. Later he subdivided organisms even farther.

Carolus Linnaeus In the 1700’s Carolus Linnaeus created a different classification system based on similarities in structures. Called “the father of taxonomy” Latinized his own name from Carl Linne’ Came up with a way to classify organisms with a two name naming system (binomial nomenclature) that would be universal to scientist all over the world.

Classification Hierarchy Domain First level is domain There are 3 domains: Archaea, bacteria, and eukarya

Classification Hierarchy The kingdom level is broken down into six smaller levels. These include phylum, class, order, family, genus, and species. Each level contains fewer types of organisms than the level before. The species level includes only one type of organism. Organisms become more closely related as you move from kingdom to species level.

Classification Hierarchy Organisms are called by their scientific name, which consists of the genus and species names. Example: Homo sapiens - humans Homo is the genus name Sapiens is the species name. Written in italics or underline Genus capitalized and species lower case

Classification Hierarchy Remember the order with the saying Dear, King, Phillip, Came, Over, For, Great, Spaghetti. Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species Many common names may be given to the same organism. An organism has only one scientific name and that name is the same for scientists all over the world.

Dichotomous Keys A method for determining the identity of something (like the name of a butterfly, a plant, a lichen, or a rock) by going through a series of choices that leads the user to the correct name of the item. A dichotomous key is a listing of characteristics, such as structure and behavior, organized in such a way that an organism can be identified or classified.

Dichotomous Keys Think of a dichotomous key as a type of scavenger hunt. Dichotomous means "divided in two parts". At each step of the process of using the key, the user is given two choices; each alternative leads to another question until the item is identified

Dichotomous Key in Diagram Form

Dichotomous Key Example 1a Flat sides ----------------> Go to 2 1b Not flat sides -------------> Go to 3 2a 4 sides ------------------> Kingdom Rectangles 2b 3 sides ------------------> Kingdom Triangles 3a Constant radius (3D) -------> Kingdom Spheres 3b Not constant radius (3D) ----> Go to 4 4a Constant radius (2D) --------> Kingdom Cylinder 4b No constant radius (2D) -----> Kingdom Heart (etc.)

Example