Middle School 7 th Grade Science Mid-Term January 2017
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1 Student Name: Date: Teacher: Period: Directions: Middle School 7 th Grade Science Mid-Term January 2017 Part I: Choose the best answer for the multiple choice questions. Mark your answers on the scantron card Part II: Write your answers directly on the test packet. 1
2 Part I 1. What is the MOST important lab safety rule? (1) Follow all written and verbal directions (2) Always tie your hair back (3) Listen to your lab partner (4) Keep your binder at your lab station 2. Based on the diagram below, what is the volume of the object in the graduate? (1) 15 cm 3 (2) 25cm 3 (3) 40 cm 3 (4) 65 cm 3 Use the diagram below to answer question How long is the bee? (1) 2cm (2) 2.5 cm (3) 3 cm (4) 3.5 cm 2
3 The data table below shows the number of Calories provided by one serving of four food items. 4. One serving of which food item on the data table provides the most energy (Calories)? (1) boiled egg (2) ice cream (3) hamburger (4) low-fat milk The diagram below shows a triple beam balance. 5. What is the maximum mass in grams that could be measured by this balance? (1) 110 g (2) 500 g (3) 610 g (4) 1510g 6. An orderly, systematic approach used to solve problems is called (1) Hypothesis (2) Scientific method (3) Data (4) Variable group 7. Which step below is performed before we form a hypothesis? (1) Analyze data (2) Draw a conclusion (3) Experiment (4) Research 3
4 An experiment is described below. A student was interested in comparing sunblock lotions, which contain chemicals that protect the skin from sunburn. The student purchased three different brands of lotion at three different prices and performed an experiment to see which one best protected the skin. The lotions cost $3, $5, and $7 for an 8-ounce bottle. The sun protection factor (SPF) was 30 for all three lotions. The student applied equal amounts of each lotion next to each other on one of her arms. The three areas covered by the lotions were the same size. The student observed the three areas for color change after two hours of Sun exposure. 8. What problem is the student trying to investigate? (1) How does sunblock prevent sunburn? (2)How does the SPF of sunblock affect the rate of sunburn? (3) How does the price of sunblock affect the rate of sunburn? (4) How does the chemical in sunblock prevent sunburn? 9. What was the dependent (responding) variable in the experiment? (1) Cost of sunscreen (2) Brand of sunscreen (3) Time of sun exposure (4) Color of skin 10. What condition was held constant? (1) Cost of sunscreen (2) Brand of sunscreen (3) Time of sun exposure (4) Color of skin 11. Which of the following statements represents a control group for this experiment? (1) An area of skin without any sunscreen on it. (2) An area of skin with different amounts of sunscreen. (3) Different amounts of time that the skin was exposed. (4) The $ 7.00 sunscreen. 4
5 12. A student set up the experiment shown below to determine if radish seeds take in oxygen as they germinate (grow). Methylene blue is a chemical that is blue when oxygen is present, but is colorless when oxygen is not present. Containers A and B each contained 200 ml of water and 10 drops of methylene blue. Ten radish seeds were added to container A. Container B had no radish seeds. The purpose of container B in this experiment is to (1) serve as the control container (2) serve as the experimental container (3) show that seeds do not give off oxygen (4) show that seeds do not give off carbon dioxide The diagram below represents four organisms. Paramecium 13. How many of the organisms represented are multicellular? (1) two (2) three (3) four (4) five 5
6 Base your answers to question 14 on the bird head diagram below. Use the dichotomous key that follows to identify the name of the bird shown. 14. What is the name of the bird in the diagram above? 1. Black skimmer 2. Baird s sparrow 3. Bald eagle 4. Osprey 15. Which groups are arranged from largest to most specific according to a modern classification system? (1) kingdom, class, genus, order phylum, species, family (2) phylum, kingdom, species, genus, family, class, order (3) kingdom, phylum, class, order, family, genus, species (4) kingdom, phylum, genus, class, species, order, kingdom, family 16. Ursus horribilis, the scientific name for the grizzly bear, refers to the bear s (1) kingdom and phylum (2) kingdom and species (3) genus and phylum (4) genus and species 17. Two organisms can be considered to be of different species if they (1) cannot mate with each other and produce fertile offspring (2) have genes from the same gene pool (3) live in two different geographical areas (4) mutate at different rates 6
7 The diagram below represents the changes in the body structure of a frog. Use this diagram to answer question The changes shown best represent (1) competition (2) growth and development (3) reproduction (4) stimulus and response 19. What life characteristic is shown in the amoeba (a one celled organism) diagram below? (1) reproduction (2) response (3) digestion (4) nutrition 20. Which statement best describes an activity that will contribute to the maintenance of homeostasis in an organism? (1) Running a race (2) Sweating on a hot day (3) Roots of a willow tree growing away from a moisture-rich region of the soil (4) A polar bear shedding most of its fur during the coldest months of the winter 7
8 21. Infants will often smile when they hear a parent s voice. In this situation, the parent s voice is considered (1) a stimulus (2) an adaptation (3) a response (4) a resource 22. What is the original source of energy for all living things on Earth? (1) The Moon (2) Algae (3) Producers (4) The Sun Base your answer to question #23 on the information provided below. Clownfish are tiny, omnivorous fish that find shelter from predators in the poisonous tentacles of sea anemones. The sea anemones sting their prey to capture food, but the clownfish are not hurt by the stinging tentacles. The clownfish clean the tentacles of the sea anemone by feeding on the plant and animal debris. They also scare off butterfly fish, which consume sea anemones. 23. The clownfish is classified as an omnivore because it eats (1) both plants and animals (2) neither plants nor animals (3) only plants (4) only animals The diagram below shows a food chain. 24. What do the arrows in the diagram above represent? (1) flow of energy (2) one community replacing another (3) life cycle stages (4) renewable resource depletion 8
9 25. Living things are classified as producers or consumers according to (1) their speed of movement (2) the size of their communities (3) how they obtain food (4) how they reproduce Use the following energy pyramid to answer questions 26 & 27. Level D Level C Level B Level A 26. As you go up the pyramid the amount of available energy? (1) Increases (2) Decreases (3) Remains the same (4) Gets larger 27. At which level would the least number of organisms be found? (1) Level A (2) Level B (3) Level C (4) Level D 28. A microscope that has two sets of lenses is called a/an microscope. (1) simple (2) electron (3) compound (4) dissecting 29. If the eyepiece is marked 10x and the objective is marked 5x, the total magnification is (1) 10x (2) 40x (3) 50x (4) 400x 30. To locate a specimen on a prepared slide with a compound light microscope, a student should begin with the low power objective rather than the high power objective because the (1) the field of view is smaller under low power (2) the field of view is larger under low power (3) the field of is darker under low power (4) you see less of the specimen under low power 9
10 31. Which of the following statements below is true? (1) The course adjustment knob is used only for low power (2) The fine adjustment knob is only used for low power (3) The course adjustment knob is used for both high power and low power (4) the fine adjustment knob is used only for both high power and low power Use the diagram below and your knowledge of science to answer question In which direction should the slide be moved to center in the image above in the field of view? (1) Down and to the left (2) Up and to the left (3) Down and to the right (4) Up and to the right Use the diagram below to answer This part of the microscope magnifies the specimen being viewed (1) A only (2) B only (3) C only (4) A and C 34. This part of the microscope allows you to regulate how much light you want shining through the stage of the microscope (1) A (2) B (3) C (4) D 10
11 35. Which of the following is not a part of the cell theory? (1) All cells come from pre-existing cells (2) The cell is the smallest unit of life (3) All cells contain a nucleus (4) All living things are made up of one or more cells 36. Which invention most influenced the development of the cell theory? (1) Balance (2) Electron microscope (3) Thermometer (4) Compound light microscope 37. The structures found in a living cell can be compared to the parts of a factory that produces cars. Which part of the factory is most similar to the nucleus of a living cell? (1) a conveyor belt that transports material (2) a storage bin that holds the pieces needed to assemble a car (3) the computer room that controls the assembly process (4) the generator that provides energy for the factory 38. The diagram below shows a cell. This cell would be found in which type of organism? (1) animal (2) plant (3) fungus (4) bacteria 39. The cell above (in #38) would be classified as a (1)prokaryote (2)eukaryote (3)blood cell (4) muscle cell 40. What structure controls the movement of materials entering and leaving the cell? (1) cell wall (2) cell membrane (3) nuclear membrane (4) endoplasmic reticulum 11
12 41. Which pair of organelles is present in both plant and animal cells? (1) mitochondria and cell walls (2) mitochondria and chloroplasts (3) chloroplasts and cell membranes (4) mitochondria and cell membranes 42. This organelle is considered to be the power-house of a cell. (1) lysosome (2) mitochondria (3) endoplasmic reticulum (4) ribosomes 43. In plant cells, photosynthesis takes place here (1) mitochondria (2) chloroplasts (3) ribosome (4) cell wall 44. In plant cells, what is the function of the cell wall? (1) it makes the plant cell flexible (2) it makes the plant cell rigid and provides structure (shape) and support (3) it is where energy is released (4) it is where excess water and waste gets stored 45. These are the tiny structures inside the animal cells and plant cells each having specific functions needed to keep the cells alive (1) atoms (2) molecules (3) organelles (4) tissue 46. In plant and animal cells, DNA (genetic material) is found in the (1) nucleolus (2) cytoplasm (3) nucleus (4) Golgi bodies 47. What two organelles are present in plant cells and absent (not present) in animal cells? (1) ribosomes and mitochondria (2) cell wall and chloroplasts (3 )Golgi bodies and vacuoles (4) cytoplasm and endoplasmic reticulum 12
13 48. In the diagram of the cell below, the structure labeled X enables the cell to: (1) Store materials (2) Manufacture proteins (3) Release energy (4) Control Nuclear Division Base your answers to questions on the article below and your knowledge of Life Science. 49. Based on this article, what is the best definition of a pathogen? (1) Something that can cause a loss of vitamins. (2) Something that can cause illness. (3) E. coli bacteria found in our food. (4) Something that can kill E. coli bacteria. 50. How does irradiation help decontaminate food? (1) It changes the taste of the food. (2) It kills the pathogens. (3) It prevents the pathogens from reproducing. (4) Both 2 and 3 are correct. 13
14 Student Name: Date : Teacher: Period: Middle School 7th Grade Science Mid-Term January 2017 Part II 14
15 PART II. Read the information below, examine the data table then follow the directions to complete the graph and answer question #1 on the following page. The laboratory setups represented below were used to investigate the effect of temperature on cellular respiration in yeast (a single-celled organism). Each of two flasks containing equal amounts of yeast in a glucose solution was put into a water bath, one kept at 20 C and one kept at 35 C. The number of gas bubbles released from the glass tube in each setup was observed and the results were recorded every 5 minutes for a period of 25 minutes. The data are summarized in the table below. Lab Setup 1 Lab Setup 2 Water bath at 20 o C Water bath at 35 o C Directions: Using the information in the data table above, construct a double line graph on the grid located on the following page. Use the directions below. 1. Plot the data for the total number of bubbles released at 20 C on the grid on the next page. Surround each point with a small circle and connect the points. 2. Plot the data for the total number of bubbles released at 35 C on the grid. Surround each point with a small triangle and connect the points. 15
16 Total # of Bubbles Released Name: Teacher: Period: Part II Answer sheet Time (min.) 1. State one relationship between temperature and the rate of gas production in yeast 16
17 2. What is the independent variable on the line graph above? 3. What is the difference between the number of frogs in the pond when the rainfall was 5cm and when the rainfall was 20cm? Show your work. 17
18 Base your answers to questions 4 through 6 on the partial food web below and on your knowledge of science. 4. Identify the two animals in this food web that obtain nutrients directly from producers. and 5. Explain why the population of trout might increase if the population of frogs decreased. 6. Identify one function of the decomposers in this food web. 18
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