Grade7 (Grade7) 1. Which of the following symbiotic relationships is considered parasitic? A. ticks feeding on a dog

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1 Name: Date: 1. Which of the following symbiotic relationships is considered parasitic? A. ticks feeding on a dog B. bees transporting pollen from flowers C. pilotfish swimming under sharks D. birds eating the insects from the back of a hippopotamus 2. Single-celled organisms can reproduce and create cells exactly like themselves without combining genes from two different parent cells. When they do this, they use a type of A. asexual reproduction. B. gamete formation. C. natural selection. D. sexual reproduction. 1

2 3. The diagram below shows some of the feeding relationships in a desert food web. Which of the following trophic levels is not shown in this diagram? A. producers B. decomposers C. primary consumers D. secondary consumers 2

3 4. The figures below represent two chromosomes from an animal. Using the table below that describes the traits carried on Chromosome #6, which trait can the animal inherit only from its mother? A. long hair B. black hair C. white hair D. short hair 5. Which body system's primary function is the continuation of the species? A. digestive B. nervous C. excretory D. reproductive 3

4 6. A partial diagram of a reproductive process is shown below. Which of the following labels belongs in the oval marked X? A. egg B. fetus C. sperm D. zygote 7. Spirogyra are green algae that can reproduce sexually. Which of the following features identifies reproduction in Spirogyra as sexual reproduction? A. The cells of parent algae have nuclei. B. Each offspring contains chloroplasts. C. Several offspring may be produced at once. D. Genetic material is contributed by two parent cells. 8. Which is an adaptation that makes it possible for the animal to survive in a cold climate? A. tail on a lizard B. scales on a fish C. stripes on a tiger D. fur on a bear 4

5 9. Which characteristic distinguishes Monerans from all other kingdoms of life? A. They are always unicellular. B. They have single cells without a nucleus. C. They move by waving their flagella. D. They can make their own food. 10. Which biome is characterized by low temperatures and low amounts of rainfall? A. tundra B. desert C. temperate deciduous forest D. tropical rain forest 11. Use the picture of a family tree below to answer this question. This family tree shows the relationship among certain primates based on the chemical composition of a protein in their blood. According to this tree, which pair is most closely related? A. spider monkeys and colobus monkeys B. baboons and gorillas C. owl monkeys and spider monkeys D. gorillas and chimps 5

6 12. Use the list below to answer this question. What class of animals has the characteristics shown in the list? A. fish B. amphibians C. reptiles D. birds 13. The following are adaptations in amphibians to live on land except A. strong bones and muscles. B. skin that stays moist. C. gills for breathing. D. a complete digestive system. 14. Which group needs an aquatic environment to reproduce? A. amphibians B. birds C. mammals D. reptiles 15. Which is a hypothesis? A. Five earthworms died when the soil became too dry. B. Earthworms have a mucous-covered outer surface. C. Heavy rain causes earthworms to move above ground. D. What will happen if an earthworm is cut in two? 16. Plasma makes up more than half of the volume of human blood. Plasma mainly consists of A. protein. B. salt. C. sugar. D. water. 17. Which activity is most harmful to the environment? A. watering the garden B. cutting the grass C. installing a wooden fence D. fertilizing the lawn 6

7 18. Which item is considered hazardous waste? A. soda bottle B. aluminum foil C. cardboard box D. motor oil 19. What happens to blood in the kidney? A. It changes from red to blue. B. It receives oxygen. C. It is pumped to move faster. D. It has waste removed. 20. Which body part works harder when a person exercises? A. nose B. heart C. kidney D. stomach 21. Which body system is needed to help a person move? A. digestive B. immune C. nervous D. reproductive 22. Which organ is NOT a sense organ? A. eyes B. ears C. nose D. throat 23. What type of muscle is found in the heart? A. skeletal muscle B. smooth muscle C. cardiac muscle D. chest muscle 24. Which system has the primary function of fighting disease? A. circulatory system B. excretory system C. immune system D. respiratory system 7

8 25. It is impossible for a skeleton to move because it lacks the A. circulatory system. B. digestive system. C. muscular system. D. respiratory system. 26. Which part of the body controls the functions of other body parts? A. heart B. lungs C. brain D. stomach 27. Use the picture below to answer this question. The picture shows food about to be mixed and chopped up in a blender. Which body part functions similar to the blender? A. heart B. stomach C. small intestine D. large intestine 28. Which organism's body form is best described as a "tube within a tube"? A. sponge B. jellyfish C. earthworm D. clam 8

9 29. A vertebrate with a skeleton made up of cartilage would belong in which class? A. Fish B. Reptile C. Bird D. Amphibian 30. The primary cause of an infectious disease is A. lack of vitamins and minerals. B. damage to a body tissue or organ. C. other organisms that enter the body. D. harmful chemicals or radiation. 31. Which of the following is the best way to investigate the effect of fertilizers on potato plants? A. Put several potato plants outdoors and several potato plants indoors and give both groups different amounts of fertilizer. B. Add fertilizer to several potato plants. C. Grow several potato plants under the same conditions but vary the amount of fertilizer added to each. D. Grow several potato plants under various temperature conditions. 32. Which trash is the least biodegradable? A. orange peel B. chewing gum C. plastic wrapper D. apple core 33. A lab report for a plant experiment contained the four statements below. Which statement is an inference rather than an observation? A. Lack of light caused the plants to grow at a slower rate. B. All of the plants bent toward the small light source. C. Each of the plants grew less than 2 centimeters. D. Several of the plants have yellow leaves. 34. Photosynthesis is the way plants make food. Which of the following are always needed for photosynthesis? A. water, light, chlorophyll, carbon dioxide B. water, light, flowers, oxygen C. water, roots, stems, leaves D. water, light, fertilizer, oxygen 35. On a cold day, snakes usually lie very still and eat little or nothing while birds usually move around and eat a lot of food. Which statement explains this? A. Both animals are cold-blooded, but without feathers to keep them warm, snakes get too cold to move. B. Unlike birds, snakes are warm-blooded and must hibernate during cold weather. C. Unlike snakes, birds are cold-blooded and are less affected by the cold than snakes. D. Unlike snakes, birds are warm-blooded and must eat food to maintain a constant temperature. 9

10 36. Which of the following types of organisms would benefit most directly from the products of decomposer organisms? A. the decomposers themselves B. the primary consumers C. the secondary consumers D. the producers 37. Which animal is probably well adapted to a hot, dry environment? A. a rabbit with small ears and fur that is brown in summer and white in winter B. a rodent that sleeps underground during the day C. a white fox with long fur, small ears, and a bulky body D. a long-legged bird that has dark feathers and eats snails and small fish 38. The process in which green plants convert energy from the Sun into energy stored in carbon-containing molecules is called A. respiration. B. combustion. C. digestion. D. photosynthesis. 39. A snake is classified as A. a mammal. B. a reptile. C. an amphibian. D. an invertebrate. 40. After walking through a field, you find a tick attached to your leg. What is the tick's relationship to you? A. predator B. decomposer C. producer D. prey 41. Oxygen is released into the air by A. the Sun. B. animals. C. volcanoes. D. plants. 10

11 42. A pyramid can be used to illustrate the flow of energy through a food chain. Which shows the correct order of the organisms in an energy pyramid? A. B. C. D. 43. A giraffe's long neck helps it to survive because giraffes can A. eat leaves in the high branches of trees. B. eat grass in the fields. C. run away from lions. D. hide from tigers and other predators. 44. The students in Mr. Smith's class wanted to learn about the ducks in a pond near their school. Which question could the class answer by making observations at the pond? A. Where do the ducks go when they migrate? B. Which part of the pond do the ducks use for feeding? C. How many ducks were there last May? D. How many years have pairs of ducks been together? 11

12 45. During photosynthesis, green plants remove a substance from the air. The substance is A. water. B. oxygen. C. sulfur dioxide. D. carbon dioxide. 46. Messages are carried from the eyes to the brain by A. bones. B. muscles. C. nerves. D. blood vessels. 47. In the presence of sunlight green plants give off A. oxygen. B. carbon dioxide. C. nitrogen. D. hydrogen. 48. The sense organ that helps you keep your balance is the A. skin. B. nose. C. tongue. D. ear. 49. What is the MOST important gas taken into the lungs during breathing? A. carbon monoxide B. carbon dioxide C. oxygen D. hydrogen 50. A dog would be classified as A. a mammal. B. a reptile. C. an amphibian. D. an invertebrate. 51. Reptiles become more active as the day gets warmer. This is because A. they have scaly skin. B. their body temperature changes with the environment. C. their body temperature stays at a constant level. D. they have slimy skin. 12

13 52. Which is NOT a reflex action? A. closing your eyes when something is about to hit them B. falling or tripping over a stone C. pulling your hand away when you accidentally touch a hot stove D. jerking your leg when the doctor taps your knee 53. How do prescription drugs travel throughout the body? A. through the blood B. through the muscles C. through the nerve cells D. through the bones 54. Which of these is an important part of the nervous system? A. spinal cord B. stomach C. veins D. muscles 55. Which of the following helps our sense organs work together? A. nerves B. muscles C. blood vessels D. skin 13