16 A. consumer E. Energy Pyramid B. food chain F. Photosynthesis A diagram that shows how much food energy is passed to each level in a food chain.A. consumerE. Energy PyramidB. food chainF. PhotosynthesisC. EcosystemG. HerbivoreD. DecomposerH. producer
18 What is the source of energy for producers? A. the sun, because producers need light to make food.B. the earth, because the soil provides warmth and nutrients.C. wind, because producers need wind to scatter their seeds.D. fresh water, because producers need water to make food
19 A. the sun, because producers need light to make food.
20 What kind of animal comes last in every food chain? A. carnivoreB. decomposerC. herbivoreD. producer
22 A. 1 percent B. 10 percent C. 50 percent D. 90 percent Suppose a colony of ants eats a plant. How much of the plant’s energy is passed to the ants?A. 1 percentB. 10 percentC. 50 percentD. 90 percent
24 Which process is NOT part of the nitrogen cycle. A. bacteria that live on some plant roots fix nitrogen gasB. plants release nitrogen compounds during transpiration.C. Bacteria break down animal wastes and dead organisms.D. lightning produces nitrogen compounds that dissolve in rain.
25 B. plants release nitrogen compounds during transpiration.
26 Which substance enables a plant to use the sun’s energy to make food? A. chlorophyllB. oxygenC. sugarD. water