WELCOME TO GRADE 7 SCIENCE



1153108583942SCIENCE FINAL (1) EXAM REVISION SHEETNAME: ----------------------------------------Grade 7------ Dec. 201900SCIENCE FINAL (1) EXAM REVISION SHEETNAME: ----------------------------------------Grade 7------ Dec. 2019Materials Required:Engineering process: (Notebook/ worksheet) Scientific method: (Notebook/ worksheet)Unit 4/ Module 1/ Lesson 2: Flow of energy. Pages: 25-40Unit 4/ Module 1/ Lesson 3: Cycling of Matter. Pages 44-58Unit 4/ Module 2/ lesson 1: Resources in Ecosystems. pages 69-82Unit 4/ Module 2/ lesson 2: Interactions within Ecosystem. pages 85-100Engineering process:Match each term with its description. Define the Problem---- A. Design requirements state the important characteristics that your solution must meet to succeed. One of the best ways to identify the design requirements for your solution is to analyze the concrete example of a similar, existing product, noting each of its key features.Do Background Research-------- B. The engineering design process starts when you ask the following questions about problems that you observe:What is the problem or need?Who has the problem or need?Why is it important to solve?[Who] need(s) [what] because [why].3. Specify the criteria and constraints ------- C. Look at whether each possible solution meets your design requirements. Some solutions probably meet more requirements than others. Reject solutions that do not meet the requirements.4. Brainstorm Solutions------- D. A prototype is an operating version of a solution. Often it is made with different materials than the final version, and generally it is not as polished. Prototypes are a key step in the development of a final solution, allowing the designer to test how the solution will work.5. Choose the Best Solution-------- E. Learn from the experiences of others — this can help you find out about existing solutions to similar problems, and avoid mistakes that were made in the past. So, for an engineering design project, do background research in two major areas:Users or customersExisting solutions6. Develop the Solution------ F. The design process involves multiple iterations and redesigns of your final solution. You will likely test your solution, find new problems, make changes, and test new solutions before settling on a final design.7. Build a Prototype------- G. There are always many good possibilities for solving design problems. If you focus on just one before looking at the alternatives, it is almost certain that you are overlooking a better solution. Good designers try to generate as many possible solutions as they can.8. Test and Redesign------- H. To complete your project, communicate your results to others in a final report and/or a display board. Professional engineers always do the same, thoroughly documenting their solutions so that they can be manufactured and supported.9. Communicate Results------- I. Development involves the refinement and improvement of a solution, and it continues throughout the design process, often even after a product ships to customers.457644529083000The Scientific Method: What is Salmonella?Salmonella is a nasty bacterium that sometimes turns up in the food supply. It thrives in the intestinal tracts of animals and humans and can cause food poisoning. Illnesses range from mild to very serious infections that can kill vulnerable people. Food Sources of Salmonella and preventions. Any raw food of animal origin -- such as meat, poultry, milk and dairy products, eggs, and seafood -- and increasingly some fruits and vegetables may carry salmonella bacteria.?People should avoid eating raw or undercooked meat, poultry, or eggs, along with unpasteurized dairy products. They should cook meat and eggs thoroughly until they reach an internal temperature of 160 F (71 0C)Design an experiment, using the scientific method, to investigate the effect of high temperature (abiotic factor) on the activity of the salmonella bacteria (biotic factor) present in row food. Describe your procedure and draw out the desired conclusion. Dependent variable: ---------------------------------------------Independent variable: -------------------------------------------Question: -----------------------------------------------------------------------------------------------------------------------Hypothesis: --------------------------------------------------------------------------------------------------------------------Materials: ---------------------------------------------------------------------------------------------------------------------------Control group: -----------------------------------------------------------------------------------------------------------------------Experimental group: ----------------------------------------------------------------------------------------------------------------Results: ---------------------------------------------------------------------------------------------------------------------------------Conclusion: ---------------------------------------------------------------------------------------------------------------------------Flow of energy.The figure shows a food chain that might exist in a meadow. DOK1 Which of these best describes what the food chain represents?A. how an organism might change over time B. the movement of organisms throughout the ecosystem C. the increase in size among organisms in the ecosystem D. the path of energy transfer from producers to consumers Each organism has its own role in an ecosystem. Organisms can be producers, consumers, or decomposers. Which of these organisms can be classified as a producer? DOK 1 abcdThis energy pyramid shows how much energy is transferred from one level to the next in an ecosystem. The amount of energy at each level is given in joules (J). DOK 2 Predict the amount of energy available at the secondary consumer level based on the observed pattern.A.0.1 J B.10 JC.100 J D.10,000 JWhat essential function do decomposers perform in recycling matter? What would happen if decomposers became extinct? DOK 3 --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- LS2-1 (Resources in Ecosystems)327025030543500Which of the following are two abiotic factors that deer need to survive and shown in the ecosystem? DOK 1Water and grassWater and airGrass and airRabbits and grass Which of these is an example of a biotic limiting factor on population size? DOK 2A.climate B.Predators C.natural disasters D.water availability The graph shows the population of a group of rabbits in a restricted area studied over a period of five years. DOK 2 Which statement might explain why the population leveled off as shown in the graph?A.The resources in the area ran out.B.The rabbits encountered a new fatal disease.C.Predators were introduced into the area.petition for resources limited the rabbit population.48875951143000Use the following ecosystem to determine which part(s) make(s) a community. DOK 2All of the wolves.The wolves and the water in the pond.The wolves, the fish, the cattails, and the aquatic plants.Water, air, and sunlight. A fish Analyze the graph and answer the corresponding questions. Identify the two characteristics (dependent and independent variables) used to classify the biomes in the graph above? DOK 1 -----------------------------------------------------------------Use the graph to find out to which biome does the savana land belong, if its average temperature is 20-300C, and it receives an average precipitation of 100-150 cm. DOK2 -------------------------------Predict to which biome do these organisms belong. justify your answer DOK 2Biotic factors/populationsBiome Justification Snake, scorpion, rodents, cactus, camel.Toucan, anaconda, jaguar, frogs, passion fruit plants, gorillas, poison dart frogs, rubber trees, giant timber bamboo,…Use the data in the table to infer the third characteristic that defines biomes, and is not shown in the graph. DOK 2 --------------------------------------------------------------------------- Develop an argument to explain the effect of abiotic factors (studied in the graph) on the carrying capacity (studies in the table). Use data from the graph and evidences from the table and from real life to support your argument. DOK 3------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Cycling of Matter.This diagram shows a portion of the carbon cycle. Arrows show the movement of carbon as carbon dioxide (CO2) moves from one part of the cycle to another. Write the letter of each process in the correct box to identify the parts of the carbon cycle shown. (3 marks)325161676835001446398447697004240530107836100A. decompositionB. photosynthesisC. cellular respirationCarbon exists in many forms on Earth. The diagram shows part of the carbon cycle. (2 marks)What is happening in step 1?A.Animals are decomposing and releasing carbon into the soil.B.Animals are releasing energy into the environment and storing carbon.C.Animals are converting carbon dioxide from the atmosphere to oxygen.D.Animals are breaking down organic molecules and releasing carbon dioxide into the atmosphere.Which of these best states how living organisms fit into the water cycle? (1 mark)A.Living organisms are a primary source of precipitation.B.The bodies of living organisms consist mostly of water.C.Living organisms are a primary source of condensation.D.The bodies of living organisms produce all the water on EarthCompare the roles of nitrogen fixing bacteria and denitrifying bacteria using the figure below: (2 marks)0876------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Ahmad planted a seed in a pot and then he measured the mass of the pot as the seed grows. The table below shows the change in mass. Time (weeks) 12345Mass (g)200250300400500Observation Seed only The seed shrinksNo seed + Baby plant with 2 small leaves. Taller plant with more leaves. Plant with leaves, buds and flowers. How did the seed change during growth? ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Explain the increase in the mass of the plant using the law of conservation of matter, knowing that the seed contains all the organic matter that launches germination. --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Interactions within EcosystemBees have a society in which different members have different responsibilities. The interaction among bees is an example of what type of behavior?petitionB.cooperationC.mensalismWhich of these is an example of commensalism?A.Two red deer compete for a territory for mating.B.A pack of wolves hunts, chases, and captures caribou.C.Marine fish eat leftover food from a predatory shark, and the shark is not affected by the presence of the fish.D.Bees in a colony performing their tasks, with drones serving the queen and worker bees gathering food.What is one way that populations within a community compete with each other?A.fighting over territoryB.sharing resources such as food and waterC.several animals working together to raise the youngD.different plants all receiving the same amount of sunlight ................
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