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Download Date: 2015 -10-13 Subject: Science Topics: Sorting things out pages
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Date: 2015 -10-13 Subject: Science Topics: Sorting things out pages 54 -55, What’s in a name pages 56 – 57, Triple play pages 58 – 59, My kingdom for a Eukaryote pages 60 – 62, Keys to success pages 64 – 65. Aim: To identify proper knowledge REWRITE THE FOLLOWING CHARTS IN YOUR SCIENCE NOTEBOOK. DO NOT PASTE THE PAPERS. Sorting things out Pages 54 -55 Why do we classify living things? Scientists classify living things based on characteristics that living things share. Sharks have fins and gills Dolphins also have fins but not gills How do scientists know living things are related? To classify organisms, scientists compare physical characteristics. For example, they may look at size or bone structure. Physical characteristics Scientists look at physical characteristics such as skeletal structure. Chemical Characteristics Scientists can identify the relationships among organisms by studying genetic material such as DNA and RNA. What is in a name? Pages 56 – 57 Scientific names Each species has its own specific name. A species is a group of organisms that are very closely related. A scientific name always includes the genus name followed by the specific name. Ex: What are the levels of classification? Triple play pages 58 – 59, What are the three domains? A domain represents the largest differences among organisms. Bacteria It is made up of prokaryotes that usually have a cell wall and reproduce by cell division. They live in almost any environment. Archaea It is also made up of prokaryotes. They differ from bacteria in their genetics and in the makeup of their cell walls. They live in harsh environments. Eukarya It is made up of all eukaryotes. My kingdom for a Eukaryote Pages 60 – 62 What are the four kingdoms in a Eukarya? They are single celled organisms or multicellular organisms. Some protists reproduce sexually while others reproduce asexually. Algae are autotrophs, which mean that they make their own food. Some protists are heterotrophs. They consume other organisms for food. It consists of multicellular organisms that have cells walls. Most plants make their own food through the process of photosynthesis. Some plants reproduce sexually and other plants reproduce asexually. They get energy by absorbing materials. They have cells with cells wall but no chloroplast. They are single-celled or multicellular. Fungi use digestive juice to break down materials around them for food. They reproduce sexually, asexually, or in both ways. It contains multicellular organisms that lack cell walls. They do not have chloroplasts like plants and algae, so they must get nutrients by consuming other organisms. Most animals reproduce sexually, but a few types of animals reproduce asexually, such as by building. Keys to success Pages 64 – 65 How do branching diagrams shoe classification relationships? Scientists often use a type of branching diagram called cladogram. It shows relationships among species. How can organisms be identified? A dichotomous key uses a series of paired statements to identify organisms.
