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Classifying organisms

Science, Grade 4

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Study Guide Classifying organisms Science, Grade 4

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CLASSIFYING ORGANISMS Scientific classification is the process of grouping living organisms into certain categories based on their characteristics, traits, and appearance. There are millions of different organisms on Earth. When scientists are discussing organisms, they need to use the same names so that there isn’t any confusion as to what organisms they are referring to while researching. This is why scientists classify animals. Lesson Checkpoint: What is one reason scientists classify animals? Several characteristics are considered when scientists classify animals into different groups. When classifying organisms, scientists consider: The number of cells an organism has—that is whether they are unicellular (have only one cell) or are multicellular (they have many cells) The type of cells organisms have, meaning whether their cells have a nucleus or not, and Whether the animal makes or finds its own food. Lesson Checkpoint: What is one characteristic that scientists consider in an organism when classifying that organism? © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
The order of scientific classification is kingdom, phylum, class, order, family, genus, and species. Some people take the first letters of each classification *K, P, C, O, F, G, S * and make up a sentence to help them remember the correct order of classification. A sentence like King Patrick Came Over For Green Slime. Each time we move to a different classification category, the groups get smaller and more specific. So, for example, there are many, many animals in a kingdom, but not as many in a genus or a species, because those are smaller groups within the kingdom. When classifying animals, KINGDOM is the largest category. A kingdom includes a great number of different kinds of organisms. Each organism within the same kingdom has similar cell structures and body functions. Scientists recognize six kingdoms to date: 1. Animals 2. Plants 3. Fungi 4. Protista 5. Eubacteria 6. Archaebacteria Lesson Checkpoint: What are the six kingdoms scientists have found so far? © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
Animal Kingdom Facts Out of the six kingdoms, the animal kingdom is the largest. # of cells: multicellular type of cells: have nucleus food: have to find own food, can’t make their own Plant Kingdom Facts # of cells: multicellular type of cells: have nucleus food: make their own food Fungi Kingdom Facts The Fungi Kingdom includes organisms like mushrooms. # of cells: most multicellular type of cells: have nucleus food: need to obtain food from other sources Protista Kingdom Facts # of cells: most unicellular type of cells: have nucleus food: some make their own/some need to obtain food from other sources Eubacteria Kingdom Facts This is the bacteria that is all around us! # of cells: unicellular type of cells: no nucleus food: some make their own/some need to obtain food from other sources Archaebacteria Kingdom Facts Is also known as ancient bacteria, found in harsh environments such as salty or extremely hot. # of cells: unicellular type of cells: no nucleus food: make their own food Lesson Checkpoint: What is archaebacteria? © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
After sorting organisms into kingdoms, scientists continue to organize the organisms into smaller groups. As scientists continue to divide animals into smaller groups, the groups get more and more specific each time. Phylum is the next category after kingdom. A well-known phylum is Chordata, which contains all animals such as fish, birds, mammals, reptiles, amphibians. These animals are all vertebrates, meaning they have backbones. After breaking the animals into phylum category, organisms are then broken down again into classes. Organisms that belong to certain class have characteristics in common with each other but not with organisms in other classes. An example of a Class is mammals. Mammals are organisms that have hair and their females produce milk for their young. The next category after Class is Order. Orders can then be broken down again into a Family. The next category is Genus, which is a group of closely related living things. © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
Finally, the genus is broken down into the Species. Species are the smallest groups. They are a group of organisms that look very similar and have the ability to reproduce among themselves. Scientists give every living organism a scientific name. An organism’s scientific name contains the genus name and the species name. Humans belong to the homo genus and the sapiens species. Our scientific name is Homo sapiens. Scientific classification goes from extremely general (kingdom) to VERY specific (species): Lesson Checkpoint: Scientific classification goes from extremely general (kingdom) to what?? © Copyright NewPath Learning. All Rights Reserved. Permission is granted for the purchaser to print copies for non-commercial educational purposes only. Visit us at www.NewPathLearning.com.
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