Study guides, Class notes & Summaries

Grade 9 Science exam review (Ontario, Canada) Decomposer - ️️ -An organismes such as bacteria and fungi that decomposes matter into nutrients trophic level - ️️ -each of several hierarchical levels in an ecosystem, comprising organisms that share the same function in the food chain and the same nutritional relationship to the primary sources of energy. Photosynthesis - ️️ -process by which plants and some other organisms use light energy to convert water and carbon dioxide int...

matter - Answer anything that has mass and takes up space chemistry - Answer the study of matter and how matter changes substance - Answer a single kind of matter that is pure, meaning it always has a specific makeup, or composition physical property - Answer a characteristic of a substance that can be observed WITHOUT CHANGING it into another substance chemical property - Answer a characteristic of a substance that describes its ability to CHANGE into different substances element - Answ...

2.4 Assignment: Investigating conductors and insulators Hypothesis: The hypothesis is that metals such as iron, zinc, magnesium, and lithium will conduct electricity and cause a light bulb to glow when connected to a circuit, based on the properties of the materials being tested. Conversely, non-metallic materials like glass, plastic, and pure water act as insulators, preventing the light bulb from illuminating when connected to a circuit

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Study guide (Science) 100% Verified Science - answerA way of learning about the natural world. Observation - answerAn investigation based on inferences. Inference - answerA guess about an observation. law - answerDescription of how things happen in nature. Theory - answerAn explanation based on evidence, of why things happen. Hypothesis - answerA testable prediction that attempts to answer a question. Independent variable - answerWhat is being purposefully being changed. Dependent variab...

Two students are doing an experiment to investigate reaction times. The diagram shows their experiment. Tester Participant (a) The statements outline the method used. They are not in the correct order. (i) Write the letters in the boxes to show the correct order of the statements. The first one has been done for you. E [2] (ii) Suggest two improvements to the method that would ensure that the measurements taken were valid. Improvement 1 .................................................

The combustion of fossil fuels for energy produces harmful substances. (a) (i) Draw lines to connect each harmful substance with the description of its major source. Harmful substance Major source [2] (ii) Explain one problem caused by increased amounts of sulfur dioxide in the atmosphere. ........................................................................................................................................... ...............................................................

A doctor uses a light microscope to look at the chromosomes in human body cells. (a) The microscope is shown in the diagram. Fine focus Part A Part B Part C Coarse focus Mirror (i) Draw lines to connect each part of the microscope with its correct name. Part Name [1] (ii) The doctor uses steps A to D to look at the cells on a slide. The steps are not in the correct order. A Turn the coarse focus until the image is as clear as possible. B Turn the fine focus until the image is as cl...

2 © OCR 2023 Stomach acid Clots the blood to prevent pathogens from entering cuts Skin Produces antibodies, or ingests and digests pathogens Platelet Barrier that prevents pathogens from entering the body White blood cell Can kill pathogens and stop them from reproducing 1 Pathogens can cause diseases in humans. Draw lines to connect each defence mechanism with the explanation of how it functions. Defence mechanism Explanation [3] 3 © OCR 2023 Turn over 2 (a) The plant geno...