Grade 7 Chapter 2 Review
Name: _______________________
Modified True/False
Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true.
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1. Shrews eat insects and earthworms. The shrew is an example of a herbivore.
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2. Plants use energy from the Sun to turn water and carbon dioxide into food material.
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3. Within an ecosystem, energy is used over and over again.
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4. A parasitic worm that infects only foxes will have no effect on the population of lemmings.
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5. A relationship that benefits one organism and does not affect the other organism in a positive or
negative way is called parasitism.
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6. Spiders eat insects that eat plants. A spider is an example of a parasite.
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7. You see a raven eating a road-killed squirrel. That raven is behaving as a carnivore.
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8. A food web is a model that shows how energy is lost at each link in the food chain.
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9. Grass is eaten by mice that, in turn, are eaten by bears. In the related energy pyramid, almost all of
the energy produced by the grass ends up in the population of bears.
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____ 10. Chickens are omnivores because they eat both plants and animals.
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____ 11. Moose and hares are examples of carnivores because they only eat plants.
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____ 12. In a parasitic relationship, the organism that provides food for the other organism is the parasite.
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____ 13. In a mutualistic relationship, both organisms benefit.
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____ 14. When an earthworm is eaten by a mole, the earthworm is an example of a nutrient.
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Completion
Complete each statement.
15. Activities such as walking, writing, and playing baseball all require the use of
____________________.
16. The original source of energy in forest ecosystems is the ____________________.
17. A thousand green plants are needed to feed a hundred insects. Those hundred insects are needed to
feed one wren. This pattern of food consumption is called a(n) ________________________.
18. Plants trap energy from the Sun to make their own food. Thus, plants fill the role of
____________________ in food chains.
19. In their ecosystem, fish, lemmings, and polar bears fill the roles of ______________.
20. Parasitism, mutualism, and commensalism are _____________ relationships.
21. A chicken will eat plants, insects and worms. Such a consumer is called a(n) ____________.
22. The model shown below is a(n) _________________________.
23. Carbon and nitrogen are examples of ____________ that might be found in a backyard fish pond.
24. A flea biting a fox is an example of the type of symbiotic relationship which is called
_____________.
25. Bees are specialized to eat nectar from plants such as dandelions and goldenrod. The dandelions and
goldenrod are ________________.
26. When decomposers have finished consuming a dead earthworm, the earthworm has been changed
into ______________.
27. Bees depend upon flowering plants for food. Flowering plants depend upon bees for pollination.
Bees and flowering plants are involved in a relationship known as _______________.
28. The model shown below is a(n) ________________.
Matching
Match the term to the appropriate description. Each term is only used once.
a. producer
f. decomposers
b. consumer
g. fermentation
c. photosynthesis
h. herbivore
d. omnivore
i. nutrients
e. carnivore
j. energy
____ 29. animals that eat plants and animals
____ 30. the breakdown of sugar to produce alcohol and carbon dioxide
____ 31. the process by which plants make their own food
____ 32. organisms that break down plants and animal materials into nutrients
____ 33. animals that eat only plants
____ 34. what all organisms need to function and survive
____ 35. used to repair cells and tissue
____ 36. an organism that eats other organisms to obtain food
____ 37. an animal that eats other animals
____ 38. an organism that obtains its energy directly from the sun
Match the term in the table below to an appropriate example. Each term is only used once.
a. food chain
f. host
b. symbiosis
g. scavenger
c. commensalism
h. food web
d. nutrient cycle
i. mutualism
e. energy pyramid
j. parasite
____ 39. Carbon moves through the biotic and abiotic parts of the environment
____ 40. A bear in the act of feeding upon a road-killed fox
____ 41. A lobster with tiny worms living on its back
____ 42. A louse in the act of feeding upon a bird’s blood
____ 43. All of the plants, insects and birds that feed upon each other
____ 44. You, whenever you allow a mosquito to make a meal of you
____ 45. Moss growing upon the bark of a tree
____ 46. One million phytoplankton feeding ten snails
____ 47. A flower, a moth, and a bat
____ 48. Termites need decomposers and decomposers need termites to digest wood
Short Answer
49. What is photosynthesis? Choose one example, and write two or three sentences to describe the
process of photosynthesis. Explain what is used, what is produced, and where the process takes
place.
50. What is a decomposer? Choose one example, and write two or three sentences to describe the role
of a decomposer. Explain what they consume, what they produce, and at what level of the food
chain decomposers act.
51. Describe a food chain that includes you, one food that you regularly eat, and one level below that.
52. Draw a nutrient cycle that includes at least four different organisms. Identify the necessary biotic and
abiotic parts.
53. Look at the illustration showing carrion beetles at work. Are they scavengers or decomposers?
Explain your answer by describing the difference between scavengers and decomposers.
Essay
54. Examine the diagram below.
a) Explain what is represented by this model.
b) Explain how scavengers and decomposers fit into this model.
55. Describe a food chain that has either a coyote or a polar bear as the consumer.
56. A moose eats grass for energy. Only about 10% of the energy from the grass is stored in the moose’s
body. Explain what might have happened to the rest of the energy from the grass eaten. Be as
specific as possible.
57. A typical food chain consists of a producer, a primary consumer and a secondary consumer.
a) What does a producer do? Choose an example to illustrate.
b) What do the primary consumer and the secondary consumer do? Explain, using appropriate
examples.
c) Draw a food chain to connect the organisms you have described