7th Grade Science Review Test 1 PDF

Summary

This is a 7th-grade science review focusing on the scientific method, variables, and basic needs for life and molecules. Topics covered include scientific theories, scientific laws, producers, consumers, and decomposers.

Full Transcript

Order of the Scientific Method (5 Steps) 1. Observation 2. Hypothesis 3. Experiment 4. Analyze Data 5. Conclusion Variables: - Independent Variable: The variable that is changed or controlled in an experiment. (In your control.) - Dependent Variable: The variable that is measured and affected in th...

Order of the Scientific Method (5 Steps) 1. Observation 2. Hypothesis 3. Experiment 4. Analyze Data 5. Conclusion Variables: - Independent Variable: The variable that is changed or controlled in an experiment. (In your control.) - Dependent Variable: The variable that is measured and affected in the experiment. (Not in your control.) Groups: - Control Group: The group that does not receive the experimental treatment, used for comparison. - Experimental Group(s): The group(s) that receive the experimental treatment. Scientific Concepts - Scientific Theory: A proposed explanation of an aspect of the natural world. - Scientific Law: A statement based on repeated experimental observations that describes an aspect of the natural world. - Scientific Theories -> Scientific Laws Basic Needs for Life - Water - Air - Shelter - Food Categories of Living Things: - Producers: Organisms that produce their own food (e.g., plants). - Herbivores: Organisms that eat plants. - Omnivores: Organisms that eat both plants and animals. - Carnivores: Organisms that eat meat. - Decomposers: Organisms that break down dead matter. Flow of Energy: Energy flows through an ecosystem from the sun, to producers, to various consumer levels, and eventually to decomposers. Molecules: 1. Proteins (Amino Acids): - Form structures and allow cells to function. - Different shapes perform different jobs. 2. Carbohydrates (Sugars): - Provide energy to living things. - End in “-ose.” - Include simple and complex carbohydrates (complex are composed of hundreds of sugar molecules). 3. Lipids (Fats): - Not soluble in water. - Serve as energy storage and insulation. 4. Nucleic Acids (Nucleotides): - Contain the information needed for cells to synthesize proteins. - Include DNA and RNA. 5. ATP: - The primary energy-carrying molecule. - Delivers energy to cells for various functions.

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