1. Tamara had two identical flowering shrubs. Both shrubs were planted in similar clay pots with the same amount and type of soil.

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1 Study Island Copyright 2014 Edmentum - All rights reserved. Generation Date: 01/08/2014 Generated By: Jennifer Penczarski Title: Eday 7th Science 1. Tamara had two identical flowering shrubs. Both shrubs were planted in similar clay pots with the same amount and type of soil. Tamara placed one plant in her back yard where it received sunlight for ten hours each day, and she placed the other plant in her front yard where it only received one hour of sunlight each day. Although Tamara gave the plants the same amount of water each day, after ten weeks, the plant in the back yard doubled in size, while the plant in the front yard withered and died. What is the best conclusion that Tamara can make? The flowering shrubs should not be watered every day. The flowering shrubs do not like to be planted in clay pots. The flowering shrubs need exactly ten hours of sunlight each day to thrive. The flowering shrubs need more than one hour of sunlight each day to thrive. 2. Which of the following biomes is characterized by extremely low temperatures, a short growing season, and an overall lack of trees? subtropical savanna arctic tundra desert shrubland tropical broadleaf forest 3. In a closed system, energy enters but does not exit the system.

2 the total amount of energy increases over time. matter enters and exits the system. the total amount of matter remains the same. 4. A population of Eastern Cottontail rabbits lives in a particular ecosystem. This population's major predator is the coyote and its major food source is vegetation. Which of the following would most likely cause a decrease in the population of Eastern Cottontails in this ecosystem? a decrease in the coyote population an increase in the coyote population an increase in vegetation in the ecosystem a decrease of disease in the rabbit population 5. The Earth's water in all of its forms makes up the. lithosphere biosphere hydrosphere atmosphere 6.

3 The length of the beetle shown above is about. 5.5 in 2 1 / 4 cm 2 1 / 4 mm 5.5 cm 7. Which of the following move(s) elements and compounds among different Earth systems, such as the atmosphere, organisms, and the solid Earth? carbon cycle nitrogen cycle hydrologic cycle all of these 8. A diagram of the hydrologic cycle is shown below. What does Arrow 1 represent? condensation run-off precipitation evaporation 9. Juan thinks that water will evaporate faster in a warm place than in a cool one. He wants to do an experiment to find out if he is correct. He has two identical bowls and a bucket of water. What should he do?

4 Place a bowl of water in a cool place and a bowl with twice the amount of water in a warm place. Place a bowl of water in a cool place and a bowl with half of the amount of water in a warm place. Place two bowls with the same amount of water in a warm place. Place a bowl of water in a cool place and a bowl with the same amount of water in a warm place. 10. Earth's atmosphere is mainly composed of nitrogen, oxygen, carbon dioxide, and water vapor. So, Earth's atmosphere can be described as a solution of elements. a nonmetallic molecule. a mixture of gases. a chemical compound. 11. Randy has a box sitting partway up a ramp. He exerts 5 N of force to keep the box from sliding down the ramp. Randy holds the box in place for 30 seconds. Kenneth uses 5 N of force to push a second box up the same ramp. It takes Kenneth 15 seconds to push the box all the way to the top of the ramp. Did Randy or Kenneth do more work, and why? Randy did more work because he applied the same force for longer. Randy and Kenneth did the same amount of work because they applied the same force. Kenneth did more work because it took him less time to get to the top of the ramp. Kenneth did more work because Randy did not do any work. 12. Which of the following correctly explains how a particular structure and its function could help an animal survive in the tundra biome? A thick fur coat could help keep a mammal warm. Brightly covered feathers could help a bird blend in with the environment to hide from predators. Long, thin legs could help any animal release heat quickly. Smooth, moist skin could help a frog's body temperature change quickly to match the air temperature. 13. An ecosystem is made up of the living community and the nonliving (abiotic) factors that affect it. Abiotic factors determine the type of ecosystem and the distribution of plants and animals within that ecosystem.

5 Which of the following is an abiotic factor found in the above picture? the insects the sunlight the grass the trees 14. The Periodic Table is organized into rows, known as periods, and columns, known as groups or families. Elements within the same family on the Periodic Table are alphabetically arranged. are very different from one another. share similar chemical properties. share a similar number of protons. 15. Which of the following provides climate scientists with information about Earth's ancient climates? weather buoys Doppler radar systems hygrometers ice core data 16. Which one of the following statements about eclipses is true? During a solar eclipse, the Moon passes between Earth and the Sun. An eclipse may last as long as five days. During a lunar eclipse, the Moon passes between Earth and the Sun. An eclipse will always occur during a meteor shower.

6 17. A graduated cylinder (pictured below) is used to measure volume. grams. mass. meters. 18. Dr. West is performing an experiment to determine how a certain chemical affects the growth rate of sunflowers. He separates 30 sunflower plants into five equal groups and gives each group a different amount of the chemical. He keeps everything else about the sunflower's environment the same, including the temperature, water, and sunlight exposure. After a month, Dr. West measures the the sunflowers in each group and reports the results of his experiment in the table below. Amount of Chemical Given Average Growth of Sunflowers 0 mg/day 4.3 cm 0.5 mg/day 4.6 cm 1.0 mg/day 4.7 cm 1.5 mg/day 5.0 cm 2.0 mg/day 3.4 cm

7 What was the dependent variable in Dr. West's experiment? the composition of the chemical the average growth of the sunflowers the amount of water given the amount of chemical given 19. Jacoby is testing the effectiveness of differently shaped parachutes. He drops a toy army man off of his roof six different times, with a different parachute attached to him each time. He times how long it takes the army man to reach the ground each time. His data is recorded below. Shape rectangular square circular triangular oval hexagonal Time (s) What is the mean value of Jacoby's results? 4.9 seconds 5.1 seconds 5.2 seconds 2.4 seconds 20. The diagram below shows the flow of food energy between the organisms in a marine ecosystem. When a whale dies, what happens to the matter that once made up its body?

8 It is used by small fishes to generate energy. It is used by crabs to generate energy. It exits the ecosystem. It is transformed into living material by phytoplankton. 21. The materials cycled through ecosystems during the nitrogen cycle and the carbon cycle decrease steadily until more of the materials are added from outside systems. increase or decrease based on the number of producers in the ecosystem. remain at constant levels, although the form and location of the materials can change. remain at constant levels and cannot change form or location within the ecosystem. 22. Plants use the energy in to make food through the process of. insects; transportation the Sun; respiration seeds; reproduction light; photosynthesis 23. The number of organisms that an ecosystem can support depends on the amount of available water. the soil composition. the temperature range. all of these 24. A rainforest ecosystem would most likely be found in which climate? dry tropical polar temperate continental 25. Energy pyramids can be used to show the amount of energy available to each trophic level.

9 According to the above energy pyramid, which level has the least energy available to it? tertiary consumers producers primary consumers secondary consumers 26. Rex makes himself a bowl of cereal. He puts 28 g of cereal in a bowl and then adds 245 g of milk. Before eating the cereal, he remembers that he has not yet finished his homework, and he runs off to his room to complete his work. Fifteen minutes later, Rex comes back to the kitchen to eat his cereal. He notices that the milk has soaked into the cereal grains and made them larger. Which of the following is true about Rex's cereal-milk mixture? The mass of the cereal-milk mixture is now less than 273 g because the cereal grains have decreased in density. The mass of the cereal-milk mixture is equal to 217 g, which is the difference in mass between the milk and cereal grains. The mass of the cereal-milk mixture is now greater than 273 g because the cereal grains have increased in size. The mass of the cereal-milk mixture is still 273 g even though the volume of the cereal grains has increased. 27. Uneven heating of the Earth's atmosphere by energy is the main factor that causes wind. solar

10 chemical electrical magnetic 28. Look at the wave below. What is shown by the letter X? amplitude wavelength frequency crest factor 29. Cynthia strikes a tuning fork with a mallet.

11 This action causes to be produced as. seismic waves; they are transferred from the mallet sound waves; the air cools down seismic waves; surrounding solids vibrate sound waves; air molecules vibrate 30. Air pressure and temperature vary with altitude. As the altitude in the lower layer of the atmosphere increases, the air pressure and the temperature. increases; decreases decreases; increases increases; increases decreases; decreases 31. Sunlight absorbed by Earth's surface is re-radiated as infrared radiation. Much of this radiation is then trapped in the atmosphere by gases that absorb it. This absorption by atmospheric gases adds additional heat to the atmosphere, which warms the Earth's surface. This process is called the greenhouse effect the jet stream precipitation the Coriolis effect 32. Note: Image is not drawn to scale When the Earth, Sun, and Moon are in the positions shown above, the height difference between high tide and low tide is at its least.

12 the height difference between high tide and low tide will be greatest. high tide occurs, but low tide does not. low tide occurs, but high tide does not. 33. What compound located naturally in the upper atmosphere helps to shield the Earth from ultraviolet radiation? ozone carbon dioxide water vapor methane 34. Hogden is conducting an experiment to determine how much force it takes for a nail to puncture a tire, causing a flat. He uses five identical nails and tests them on five identical tires filled with equal amounts of air. He hits each nail one time, applying a different force each time. His results are recorded below. What can Hogden conclude from his results? Trial Force (lbs) Result nail no flat nail no flat nail no flat nail flat nail flat It takes between 45.0 and 60.0 pounds of force on the nail to cause a flat. It takes exactly 60.0 pounds of force on the nail to cause a flat. It takes between 60.0 and 75.0 pounds of force on the nail to cause a flat. It takes exactly 45.0 pounds of force on the nail to cause a flat. 35. The ph of a substance is a measure of how acidic or basic it is. If a substance has a ph of 11, it is. neither an acid nor a base a base an acid

13 both an acid and a base 36. Regina has been growing sunflowers in her backyard so she can harvest their seeds. The sunflowers are all growing in the same type of soil and receive the same amount of sunlight. Regina has also provided them all with the same amount of water. So far, the sunflowers have all grown the same amount. Regina's grandfather comes to visit, and he tells Regina that the flowers will produce more seeds if she gives the flowers Fertilizer X. Regina would like to try the fertilizer, but it is very expensive. She decides to test the fertilizer in a scientific investigation before purchasing enough for all of the sunflowers. Which of the following questions can Regina answer through a scientific investigation in order to test her grandfather's claim? Will Regina's grandfather be upset if she uses a cheaper fertilizer that works as well as Fertilizer X? Would it be wiser to use Fertilizer X on vegetable plants since it is so expensive? Will providing sunflowers with Fertilizer X cause the flowers to produce more seeds? Will providing sunflowers with Fertilizer X result in more attractive flowers? 37. When the lightbulb in the picture above is plugged in, what energy transformation will take place? Mechanical energy will be transformed into heat energy. Heat energy will be transformed into light energy. Light energy will be transformed into electrical energy. Electrical energy will be transformed into heat energy and light energy. 38. Radiators heat the air molecules around them so that they move faster and father apart. This causes the density of the molecules to decrease, so they are able to rise over the slower, denser and cooler air molecules.

14 This cyclic pattern of rising hot air and falling cool air is called radiation. conduction. thermal energy. convection. 39. When working with chemicals that could be harmful to your skin, clothing, or eyes, it is important to wear. long, drooping sleeves sandals jewelry safety goggles 40. Seismic waves travel through the Earth. Some seismic waves travel side to side while others travel up and down. Seismic waves are usually produced by earthquakes. Earthquakes are able to knock over buildings because seismic waves transfer. energy and matter energy sound and matter matter