REVISION WORKSHEET (1) Diversity of life Syllabus coverage pgs

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1 United Arab Emirates Abu Dhabi Educational Council Int'l Jubilee Private School American Syllabus Student Name: Grade: 8 a,b Date: / / 2013 Subject: Science Revision REVISION WORKSHEET (1) Diversity of life Syllabus coverage pgs Choose the best answer 1.Which of the following is a situation that could lead to the extinction of a species? A. increased habitat B. increased food supply C. increased competition D. increased population size 2. Which of these answers best describes a fossil? A. thick layers of rock B. organism from which other organisms are descended C. body of an organism that died recently but has not decomposed D. remains of a once-living organism found in layers of rock, ice, or amber 3. Which of these best describes the tiny leg bones that some whales have, which do not aid in their movement or serve any other function? A. structures that grows and improves in function as they are used B. structures that will become adaptations when the environment changes C. structures that have lost all or most of their function over evolutionary time. 4.What is the genetic material that organisms pass on to their offspring when they reproduce? A. DNA B. food C. cells D. energy Pretest 1 Module B Assessment Guide

2 5. The figure below shows two spotted salamanders that belong to the same species. How does the concept of variation help us understand that the salamanders are members of the same species, even though they look slightly different? A. Variation explains why some organisms survive while others do not. B. Variation describes a range of physical traits among members of a species. C. Variation describes a group of organisms that live together in the same area. D. Variation explains the process by which populations gradually change over time. 6.. The following diagram shows one type of living thing. What type of organism is shown in the above image? A. producer B. consumer C. decomposer D. the diagram does not show a living thing Pretest 2 Module B Assessment Guide

3 7. The image below shows an organism from one of the four main divisions of the geologic time scale. The organism above lived during which major division of geologic time? A. Precambrian B. Paleozoic C. Mesozoic D. Cenozoic 8. What is a mass extinction? A. the death of one member of a species B. the death of every member of a species C. the death of select members of a species D. the death of all members of many different species. 9. Define the following terms in your own words. Homeostasis Asexual reproduction _ Pretest 3 Module B Assessment Guide

4 Cell Q 10. Differentiate between cast fossils and amber fossils. Extinction Mass E xtinction Q11.Who was Darwin? What did he observe on Galapagos island? Q 12. Describe how an adaptation may have allowed giraffes to survive in savanna ecosystems. Q13 Suppose a population of giraffes in a certain savanna thrives. More giraffes eat more leaves from the trees, until the trees that are closest to the ground are picked clean. Which giraffes would be most likely to survive in this changing environment? Q14. Scientists use different types of evidence to support the theory of evolution. Four types of evidence are: fossil evidence, structural evidence, genetic evidence, and embryological evidence. Select two of the four types of evidence and explain how they can be used to support the theory of evolution. Pretest 4 Module B Assessment Guide

5 Revision worksheet (2) Matter and Energy syllabus coverage pgs Q 1. Check the box to show whether each statement is true or false. T F 1.Matter is anything that has mass and takes up space. 2.An element is a substance that is made up of one type of atom. 3.Evaporation is the change of state from a gas to a liquid. 4.A solid has a definite volume and shape. 5.A physical property can be measured without changing the identity of the substance. Q2. Two balloons are inflated to an equal volume. Balloon 2 is placed in the freezer for 20 minutes. Pretest 5 Module B Assessment Guide

6 Why would freezing a balloon produce the results shown in Balloon 2? A. Increased kinetic energy decreases the attraction between particles inside the balloon. B. Increased kinetic energy increases the attraction between particles inside the balloon. C. Decreased kinetic energy decreases the attraction between particles inside the balloon. D. Decreased kinetic energy increases the attraction between particles inside the balloon. Q3.A rock is dropped into a graduated cylinder filled with 35 ml of water. What is the volume of the rock? (Hint: 1 ml water = 1 cm 3 ) A. 40 cm 3 B. 14 cm 3 C. 5 cm 3 D. 35 Describe the difference between a chemical change and a physical change. Pretest 6 Module B Assessment Guide

7 What are three examples of physical changes? What are three signs that a chemical change has taken place? How does temperature affect chemical changes? Revision worksheet Intro. to science and technology Syllabus coverage pgs CHOOSE THE BEST ANSWER. Q 1. A biomedical company uses a certain type of bacteria to manufacture a new medicine. A researcher for the company studies how temperature affects the rate at which the bacteria reproduce. He records his results in a graph. Pretest 7 Module B Assessment Guide

8 Currently, the company grows the bacteria in a lab maintained at 18 C. If the company wants to grow the bacteria as quickly as possible, which recommendation should the researcher make? A. The current lab temperature is ideal for growing the bacteria. B. The lab temperature should be increased to between 20 C and 30 C. C. The lab temperature should be increased to between 30 C and 40 C. D. The lab temperature should be increased to between 40 C and 50 C. Q2. Scientists depend upon various traits to carry out their work. An example is shown in the figure below. Which of these terms best describes the scientist in this figure? A. creative C. observant B. logical D. skeptical Q3. Which of these answers best describes a scientific theory? A. an explanation based on the opinion of a scientist B. a well-supported and widely accepted explanation of nature C. a description of a specific relationship under given conditions D. a statement describing what always happens under certain conditions Q 4. A student is studying plants that grow in different areas and receive different levels of carbon dioxide from their environments. The student finds that in one area, plants have shown tremendous growth, whereas in another area, plants have shown little to no growth. The student hypothesizes that the different levels of carbon dioxide contributes to the differences noticed in the plants. Which of the following would best test this hypothesis? Pretest 8 Module B Assessment Guide

9 A. a model that simulates weather and the water cycle in the plant areas B. fieldwork to identify additional plant types in other areas C. a controlled experiment in which the student attempts to control all variables except the carbon dioxide level D. surveys of people on whether the plants they prefer to grow in their homes and gardens Q5. Which of these scientists would most likely engage in fieldwork to observe organisms? A. chemist B. biologist C. physicist D. mathematician Q6. The figure below shows a concept related to the kinetic theory of matter, which describes the behavior of gases based on the motion of the particles. How would the kinetic theory explain what is happening in the above example? A. The balloon gets bigger as the temperature of the gas inside it decreases, because the gas particles move faster and get farther apart. B. The balloon gets smaller as the temperature of the gas inside it decreases, because the gas particles begin to escape from the balloon. C. The balloon gets bigger as the temperature of the gas inside it increases, because the gas particles move faster and get farther apart. D. The balloon gets smaller as the temperature of the gas inside it increases, because the gas particles move more slowly and get closer together. Q7.Simon is presenting a project on scientific laws and theories. Which of the following statements should he include to explain the differences between the two? A. Scientific theories requires scientific evidence but scientific laws do not. B. Scientific theories are based on observations and scientific laws are based on opinions. C. Scientific theories explain why something happens, and scientific laws describe what happens. D. Scientific theories are rarely changed and scientific laws are modified frequently. Answer the following questions in the space provided. Pretest 9 Module B Assessment Guide

10 Q 8.Using an example, explain the difference between a hypothesis and a prediction. Q9. Evaluate the strengths and limits of science in terms of scope. Q10. How would you distinguish a scientific theory from a scientific law? Pretest 10 Module B Assessment Guide