7 th Grade Life Science Review Questions

1. 7th Grade Life Science Review Questions

2. 1. The diagram shows an energy pyramid for a marshland ecosystem. According to the diagram, the greatest loss of energy takes place between A. producers and first-order consumers. B. first-order and second-order consumers. C. first-order and third-order consumers. D. second-order and third-order consumers.

3. 2. Which experiment is BEST to determine if temperature affects the growth of ivy plants? A. Keep one ivy plant in a dark refrigerator and another on a windowsill near a heater. B. Put one ivy plant in a shady window and another in a sunny window. C. Keep two ivy plants side by side, but water one with cold water and the other with warm water. D. Put one ivy plant in a cool place and another in a warm place, but give both the same amount of light and water.

4. 3. The graph below shows the relative rates of action of a specific enzyme at different temperatures. As the temperature increases from 30°C to 50°C, the rate of action of this enzyme A. remains the same. B. increases only. C. decreases only. D. increases, then decreases.

5. 4. According to the graph, as light intensity increases, the rate of photosynthesis A. remains constant. B. increases continuously. C. increases and then levels off. D. increases and then decreases.

6. 5.Which quotation is an example of a scientist making an observation? A. “I think jellyfish will move toward the ocean surface at night.” B. “Four of the five jellyfish moved toward the ocean surface at night.” C. “Do jellyfish move toward the ocean surface at night?” D. “The data support my idea that jellyfish move toward the ocean surface at night.”

7. 6.Dan and Rose want to find out whether the fifteen-year-old boys in their school are taller, on the average, than the fifteen-year-old girls. The school nurse has the following information about each student. Which information would NOT be useful for answering their question? A. name of student B. date and year of birth C. height of student D. sex of student

8. 7.About how many bacteria colonies were MOST LIKELY in the culture after 96 hours? A. 18 B. 20 C. 24 D. 32

9. 8.Which is MOST important to do in an experiment? A. make sure measurements can be made quickly B. control all important variables C. use new equipment D. have at least two persons working together

10. 9.If you accidentally break glassware during lab, you should A. tell your teacher. B. clean it up, then tell your teacher. C. just clean it up very well, and throw it in a trash container. D. leave it for the janitor to clean up.

11. 10.Which unit is the BEST to use when measuring the size of a bacteria cell? A. micrometer (0.000001 m) B. millimeter (0.001 m) C. centimeter (0.01 m) D. kilometer (1,000 m)

12. 11.This graduated cylinder is used to measure A. volume. B. mass. C. grams. D. meters.

13. 12.Which unit should you use to measure one dose of cough syrup? A. kilograms B. centimeters C. meters D. milliliters

14. 13.Which scientific development was made possible by the invention of the light microscope in the seventeenth century? A. study of the cell as the basic unit of plant and animal structure B. discovery of all nine planets in the solar system C. study of atoms as the basic units of elements and compounds D. discovery of radio waves for the transmission of voice across long distances

15. 14.Which is the correct sequence of organization from LEAST complex to MOST complex? A. organism, system, organ, tissue, cell B. organism, organ, tissue, system, cell C. cell, tissue, organ, system, organism D. organism, cell, tissue, organ, system

16. 15.The cells of two multicelled organisms are analyzed. The results are shown in the table below. Based on this information, it can be concluded that A. Organism A is an animal and Organism B is a plant. B. Organisms A and B are both plants. C. Organism A is a plant and Organism B is an animal. D. Organisms A and B are both animals.

17. 16. Which BEST describes a reason why nonvascular plants, such as mosses, grow close to the ground? A. They do not require much sunlight. B. They lack true roots and stems. C. They grow in cooler temperatures. D. They do not produce seeds.

18. 17.A group of cells looks like this under a microscope. These cells all work together to do the same thing. A group of cells like this is called A. an organ. B. an organism. C. a tissue. D. a system.

19. 18.Why are antibiotics, which kill bacteria, NOT used to treat the flu or the common cold? A. Antibiotics are not strong enough. B. Flu and colds are caused by viruses. C. Doctors cannot give powerful drugs for simple diseases. D. Flu and cold germs have become resistant to antibiotics.

20. 19. One way to slow bacterial growth in some foods is to A. pasteurize the food. B. increase the food’s moisture content. C. warm the food to room temperature. D. expose the food to air.

21. 20.Today, noninfectious disease is the leading cause of death. A century ago the leading cause of death was infectious disease. This change is largely a result of A. the popularity of nutritious foods and exercise. B. the introduction of vitamin and mineral pills. C. improved sanitation and the use of antibiotics. D. better training for doctors and nurses.

22. 21.Which is the basic unit of heredity? A. gene B. chromosome C. mitochondria D. nucleus

23. 22. Each person receives genes from his/her father and mother. Each of those parents received genes from his/her own parents. What percentage of a person’s genes comes from each grandparent? A. 10% B. 25% C. 50% D. 75%

24. 23.If a brown guinea pig with the genes Rr mates with a white guinea pig with the genes rr, what are the possible gene combinations of the offspring? A. RR and rr B. Rr and rr C. RR and Rr D. rr only

25. 24.A female cat had her tail cut off in an accident. A few months later, she had eight kittens. How many of the kittens probably had tails? A. 0 B. 2 C. 4 D. 8

26. 25.Which is the smallest of the classification groups? A. class B. family C. kingdom D. species

27. 26. The Punnett square shows the result of a cross between two parents. Which represents the genotypes of the two parents? A. FF and FF B. Ff and Ff C. FF and ff D. Ff and ff

28. 27.A girl found the skull of an animal. She did not know what the animal was, but she was sure that it preyed on other animals for its food. What clue probably led to this conclusion? A. The eye sockets faced sideways. B. The skull was much longer than it was wide. C. Four of the teeth were long and pointed. D. The jaw could move sideways as well as up and down.

29. 28. Which drawing represents a type of bacteria?

30. 29. Which is the most direct source of energy used by the mushroom? A. It uses sunlight to make energy. B. It uses energy made by plants growing nearby. C. It uses energy from decayed matter in the soil. D. It uses energy from the stored food in its seed.

31. 30.Today, almost no one gets polio because A. doctors have found new drugs that cure polio when it happens. B. contaminated water, which used to cause polio, has been cleaned up. C. people are given a vaccine that keeps them from getting polio. D. people eat better food and get more exercise, so they are healthier.

32. 31. Which organs and tissues make up the circulatory system? A. brain, spinal cord, and nerves B. liver, stomach, and esophagus C. heart, arteries, and veins D. lungs, trachea, and nose

33. 32.Which BEST explains why marine algae are most often found in the top 100 meters of the ocean? A. Marine algae can live only where there is light for photosynthesis. B. Marine algae have no roots to anchor them to the ocean floor. C. The pressure is too great for marine algae to survive below 100 meters. D. The temperature of the top 100 meters of the ocean is ideal for marine algae.

34. 33.The offspring of a plant that reproduces asexually will A. share all of the parent’s characteristics. B. be incapable of producing flowers. C. fail to grow and develop normally. D. develop fruit even if the parent did not.

35. 34.Sharks and rays differ from other fish primarily because they A. are warm-blooded. B. have skeletons made of cartilage. C. do not breathe through gills. D. have fins on their backs.

36. 35. Animals get energy from the food they eat. What is the original source of this energy? A. the soil B. the water cycle C. the Sun D. fertilizer

37. 36.Which characteristic do all of these organisms share? A. They are consumers. B. They are predators. C. They are producers. D. They are vertebrates.

38. 37.If all green plants died, what would be the most important effect on humans? A. They would survive by eating meat only. B. They would all eventually die. C. Humans would only get sick without vitamins from plants. D. Humans would evolve into a new species.

39. 38.Which two biomes have very limited precipitation? A. coniferous forest and grassland B. desert and taiga C. temperate forest and prairie D. tundra and desert

40. 39.In ecosystems, the Sun’s energy is transferred through food webs, as shown below. In the food web, the Sun’s energy is MOST directly available to people through A. path A. B. path B. C. path C. D. path D.

41. 40.If you started at the North Pole and traveled south, which is the first biome you would find? A. desert B. temperate (deciduous) forest C. tropical rain forest D. tundra

42. 41. Which are the two MOST important factors that determine the climate in any biome of the world? A. temperature and precipitation B. prevailing wind and precipitation C. mountain ranges and temperature D. prevailing wind and mountain ranges

43. 42.Mary Ann’s class was planning a weeklong camping trip. Her teacher said the area is high in the Rocky Mountains, where snow is common. Conifers such as spruce and hemlock are abundant around the camp. Animals they might see include elk, bighorn sheep, moose, and grizzly bears. In which biome is this camp located? A. tundra B. taiga C. grassland D. desert

44. 43.A pesticide was sprayed at time x and again at time y. The graph above shows that some of the pests survived after being sprayed at time x. Which statement BEST explains the information shown in the graph? A. Offspring of the survivors were all killed by the pesticide. B. Offspring of the survivors were not affected by the pesticide. C. Offspring of the survivors were better able to survive the pesticide. D. The survivors were unable to produce viable offspring.

45. 44.Sometimes two organisms of different species are adapted to living together for the mutual benefit of both. This is demonstrated by a fungus and an alga living together to form a lichen. This association is a type of A. parasitism. B. symbiosis. C. protective adaptation. D. camouflage.

46. 45.Whale ancestors were land animals that moved to the sea long ago. The fossil record shows that, over many generations, the nostrils moved back to where the whale blowhole is now. Why is this adaptation an advantage for the whale? A. It helps the whale smell things better in the water. B. It prevents water from going into the lungs. C. Having the blowhole on top reduces drag as the whale swims. D. The whale does not have to lift its head out of the water to breathe.