7th Grade Science ALL ANSWERS 100% CORRECT SPRING FALL-2023/24 EDITION GUARANTEED GRADE A+

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Scientists are studying fertilizers to help grass grow in southern California. Fertilizer is any substance that can be added to soil to help plants grow in it. In other words, fertilizer makes soil mo... re fertile. The scientists set up different plots of land that all use the same type of soil, but they use different types of fertilizer in each plot. Scientists then measure the grass growth in the different soils over time. How should scientists set up the control group in this experiment? a plot with grass but no fertilizer in the soil For a comparative or experimental investigation, scientists often make a testable ________________ about a scientific question, and then they test it in the investigation. Hypothesis What does a control group show in an experimental investigation? how nature would act without manipulation by the researchers Scientists are studying different jackets made for extremely cold, snowy weather. They are trying to find jackets that are warm but also thin enough to allow for natural bodily movement. Which question could the scientists answer scientifically? Which jacket's color looks the best? Which jacket traps the most heat? Would warm and thin jackets cost less? Which jacket seems the most professional? Which jacket traps the most heat? In an experimental investigation, the group that is not manipulated by the researcher and is then compared to the experimental group is called the ___________ group. control Scientists are studying a group of living cells under a microscope. They write down notes about the size, shape, and color of the cells as well as other traits. Which best describes this type of investigation? descriptive, because the scientists are writing down observations but not making comparisons In an experimental investigation, the variable that the researcher changes or manipulates in order to see its effects is called the ___________ variable. independent Which types of questions can most likely be answered through a scientific investigation? objective questions Tyler wants to learn about the types of insects in the soil near his house. Which would be a benefit of carrying out a descriptive investigation? He could collect a large amount of data for a low cost. Scientists are investigating how well different microphones capture and record sounds. They use tools that show how loud the high and low sounds are and a tool that shows how much noise is recorded along with the actual sounds. Which microphone captures a singer's low sounds the loudest? Which is the best description of a scientific theory? an explanation of many observations and tested hypotheses How did Louis Pasteur's experiments lead to new scientific understandings of germs? Experiments with cooking food showed that disease-carrying germs in food could be killed when heated. What is a factual statement about how nature behaves or functions? a law A student proposes this hypothesis in class: "If I make the angle of a ramp steeper, then a ball rolling down the ramp will be going faster when it hits the ground." Which part of a hypothesis should the student add to this that could also be tested in other experiments? an explanation based on prior scientific knowledge or observations Imagine that a team of scientists test a certain hypothesis, and the experimental results show that it is false. How will this information most likely be helpful in the future? The results will be on record and can inspire a new hypothesis. What would most likely occur over time if new technologies gave us information that challenged what scientists currently understand about natural selection? A current scientific theory would be revised based on the new findings. Darwin developed the theory of evolution to explain why there are so many different kinds of living things. He could easily observe that offspring of any animals were slightly different from their parents and that this could allow for big changes over thousands of years. He did not know that genes caused the differences. Genes are now very important in the modern theory of evolution. What most likely led to a change in the widely accepted theory of evolution? new experiments involving genes and evolution Which of these are characteristics of a scientific law? Check all that apply. It contains an explanation of facts. It states a fact about how nature works. It is based on observations of nature. It often changes over time with new experiments and technology. It explains why a group of hypotheses are related. It will most likely remain true even when scientists work with new experiments. It states a fact about how nature works. It is based on observations of nature. It will most likely remain true even when scientists work with new experiments. Albert Einstein changed the way we think about gravity by using the results of many new experiments to explain that giant objects like Earth bend the space around them. According to Einstein, this bending of space makes smaller objects move toward larger objects. Which statement best explains whether Einstein's idea is a theory or a law? It is a theory because it was developed with many new experiments, and it explained the observations. Albert Einstein first hypothesized that a large object, such as a planet, bends the space around it. This hypothesis became part of the theory of relativity, which is about how objects affect the space and time around them. What did this hypothesis most likely need before it became part of an accepted theory? experimental evidence supporting the hypothesis Which best describes what occurs when technology advances? Models improve Which is an electronic tool that can be used to improve science probeware A _________ is a simplified representation of a real object or system. model Which advancement in technology has increased scientific knowledge of planets other than Earth? microscopes Jillian made a model of an animal cell. She used a round balloon to represent the cell membrane. She pushed objects like marbles and rocks into the balloon to show cell parts, then filled it with water to show fluid inside the cell. What is a limitation of Jillian's cell model? It does not show the functions of the cell parts. Which piece of technology allowed scientists to look for life on Mars? a rover A comet is expected to pass by the Earth. Francis wants to see as much detail of the event as he can. Which technology allows him to view the comet? a telescope Bacteria are organisms that need to be viewed with a microscope. Darla designed a model of bacteria using household items such as macaroni and string. Which best describes the advantage of her model? She was able to represent something small in a larger way. Igor broke his arm playing football. When he went to the doctor, the doctor ordered a specific test for Igor. Which technology would best allow the doctor to view the break? an x-ray Which best describes the relationship between science and technology? Technology uses scientific knowledge to create solutions to real-world problems. Wyatt got a minor burn on his arm. Which explains what he should do? run cold water over it for 10 to 15 minutes and then cover the area with light gauze Adelyn cut herself on broken glass in the classroom. She started bleeding and needed assistance from her teacher. put on her gloves and use the first aid kit to treat the cut Which steps are important to complete before starting a laboratory experiment? Check all that apply. Read the procedures. Review the required equipment. Discard chemicals in the proper waste bin. Ask the teacher if you are confused about the laboratory procedure. Change into contact lenses to protect your glasses. Know where all the safety equipment is located. Read the procedures. Review the required equipment. Ask the teacher if you are confused about the laboratory procedure. Change into contact lenses to protect your glasses. Know where all the safety equipment is located. When working with chemicals, many pieces of safety equipment need to be available in case of an emergency. Prior to beginning his experiment, Santos looked for all the safety equipment. He wanted to identify which equipment would rinse a chemical spill on skin. Which equipment should he be looking for? eye wash station and safety shower Ulysses was working with glassware in the laboratory and accidentally dropped a beaker. He first notified his teacher, put on gloves, swept up the glass quickly, and disposed of the glass in the trash can. Which best describes the error Ulysses made? He should have put the glass in a broken glass bin. Which student made a laboratory error? Neve cleaned up her workspace. Ben washed his hands before laboratory. Ophelia kept her water bottle on the table. Kai told his teacher when a glass broke. Ophelia kept her water bottle on the table. Which equipment is used to stop fires in a laboratory? Check all that apply. extinguisher Bunsen burner blanket eye wash first aid kit extinguisher blanket Which student was practicing poor laboratory safety? Gunther read all the safety precautions for an experiment and collected his chemicals. Herbert started mixing his chemicals as the teacher began explaining the lesson. Francine washed her hands after spilling table salt on them. Reilly tied her hair back into a ponytail after putting on her lab coat. Herbert started mixing his chemicals as the teacher began explaining the lesson. Which is the proper order for using a fire extinguisher? pull, aim, squeeze, sweep sweep, squeeze, aim, pull aim, pull, sweep, squeeze pull, sweep, aim, squeeze pull, aim, squeeze, sweep Convert 325 milliliters to liters. 0.325 liters 3.25 liters 32.5 liters 325 liters 0.325 liters Convert 1,650,000 centimeters to kilometers. 1.65 kilometers 16.5 kilometers 165 kilometers 1,650 kilometers 16.5 kilometers How many kilometers are in 56,213 meters? 56.213 kilometers 562.13 kilometers 56,213 kilometers 56,213,000 kilometers 56.213 kilometers Which are base units used in the metric system? Check all that apply. quarts liters grams degrees Fahrenheit degrees Celsius pints liters grams degrees Celsius How many grams are in 1.3 decigrams? 0.013 grams 0.13 grams 13 grams 130 grams 0.13 grams A student needs to use the metric system while measuring the length of a box. Which units should he use? centimeters inches feet yards centimeters How many grams are in 0.50 kilograms? 0.50 grams 50 grams 500 grams 50,000 grams 500 grams Which unit is used to measure temperature in the International System of Units? degrees Fahrenheit degrees Celsius radians therms degrees Celsius Which unit represents 100 meters? hectometer kilometer decameter centimeter hectometer Another word for 10 meters in the metric system is _____________. decimeter Which statement gives quantitative data? Some of the growth rings are wider than others. The tree was 20 years old when it was cut down. A forest fire burned the tree during the years that it was alive. The widest growth rings indicate years that had the most rainfall. The tree was 20 years old when it was cut down. Which type of data is qualitative data? heights in meters volumes in milliliters calculations of density descriptions of behavior descriptions of behavior Which statement correctly describes the data shown in the graph and the type of observation used? The gingko tree grew 14 feet; this is a qualitative observation. The bur oak tree's growth rate averaged 2.5 feet per year; this is a quantitative observation. The bur oak tree is twice the height of the ash tree; this is a qualitative observation. The Norway spruce grew more slowly than the sycamore every year; this is quantitative data. The bur oak tree's growth rate averaged 2.5 feet per year; this is a quantitative observation. Dan gave five sunflower seedlings each a different type of fertilizer. He measured the initial and final heights of each plant after a month, then calculated the total growth of each one in centimeters. Which is the best method for visually representing the data for comparison? bar graph pie graph data table Venn diagram bar graph Where in a data table should units of measurement be shown? in a separate column after the column of data values in parentheses, in the title of the table in the headings of columns that list the data values in a note next to an asterisk, below the table in the headings of columns that list the data values Some tools have graduations to show multiple measurements. For example, a ruler may have graduations for both millimeters and centimeters. When measuring the length of an earthworm, which graduations would allow for the most accurate measurement? millimeters centimeters decimeters meters millimeters Which is usually the best way to present or communicate inferred data? in a bar graph in a data table in a simple diagram in a written paragraph in a written paragraph Professor Tan studies water quality in streams near chemical plants. Which is a type of qualitative data that Professor Tan should record during these studies? the pH of the water any occurrences of unusual odors the oxygen concentration of the water any changes in sizes of fish population any occurrences of unusual odors In a scientific investigation, the term "quantitative data" refers to numbers that are usually followed by units. graphs. written descriptions. photos of measurement. units. Angel is trying to find out the distribution of money earned each year by website builders so that he can make some predictions about the career. He wants to make a chart or graph to show the number of people who fall into each salary range: $30,000 to $40,000, $40,000 to $50,000, $50,000 to $60,000, and $60,000 to $70,000. What type of chart or graph would be best for Angel to use? a scatterplot a histogram a line graph a bar graph a histogram What is the mean of the data set [3, 2, 2, 12, 6, 5, 14, 4]? 2 4 6 7 6 A college student conducts a survey to find out the average age at which human males start to grow facial hair. The student asks each subject of the survey how old he was (in months) when he first noticed hair on his face. Six boys from a local high school were surveyed, and the average value found is 148 months. [Show More]

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