NAME:______________________PERIOD:____DATE:________
Energy Flow & Cycles
Directions: For each statement write true or false in the blank.
______1. An organism’s niche includes its habitat.
______2. Trophic levels describe the differences in size of the organisms in a
habitat.
______3. Carnivores obtain nutrients by eating other consumers.
______4. Organisms that feed on dead organisms are called scavengers.
______5. Humans are classified as carnivores.
______6. All of the energy available to organisms at each level of the food
chain stored.
______7. A food chain is the specific sequence in which organisms obtain
energy in an ecosystem.
______8. Food chains usually consist of eight or nine levels.
Directions: Determine if the statement is true. If it is not, rewrite the underlined
part to make it true.
______ 9. Biology means the study of interactions among organisms.
______ 10. Sunlight and temperature can be biotic factors for a particular organism.
______ 11. Autotrophs make their own energy.
______ 12. If you are studying a population of squirrels, then you are studying a
community.
Directions: Fore each statement below, decide whether it relates to the nitrogen
cycle, carbon cycle, oxygen cycles, water cycle, or all of the cycles. Write “N” for
nitrogen, “C” for carbon, “W” for water, and “A” for all
______ 13. This is a biogeochemical cycle.
______ 14. Plants make proteins and nucleic acids from ammonia.
______ 15. Evaporation, transpiration, condensation, and precipitation are involved.
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_____ 16. Living organisms incorporate into their bodies’ substances that are returned
to the environment when they die.
_____ 17. The burning of fossil fuels has changed the normal balance in this cycle.
_____ 18. Photosynthesis and cellular respiration are involved in this cycle.
Directions: Choose that one best response. Write the letter of that choice in the
space provided.
______19. A food chain generally begins with:
A. autotroph
B. omnivore
C. decomposer D. heterotroph
______20. Interrelated food chains are called a:
A. food niche B. food web
C. habitat
D. food chain
______21. Which group of organisms is responsible for releasing nutrients back
into the ecosystem so that the nutrients may be recycled by
producers?
A. insects
B. bacteria
C. mammals
D. phytoplankton
______22. The greatest amount of energy in an ecosystem is available to:
A. producers
B. primary consumers
C. secondary consumers
D. decomposers
______23. Energy that is lost at each trophic level of an ecosystem is
replenished by
A. heat
B. nutrients
C. sunlight
D. organisms
______24. Besides energy, what moves through the organisms at each trophic
level of an ecosystem?
A. organisms
B. nutrients
C. sunlight
D. cycles
______25. Autotrophs and heterotrophs use carbon molecules for energy and
A. photosynthesis
B. growth
C. decomposition
D. A and B
______26. What do plants use in photosynthesis to make carbon molecules?
A. carbon dioxide
B. carbohydrates
C. fertilizer
D. oxygen
______27. Heterotrophs get carbon molecules by
A. growing
B. feeding on other organisms
C. decaying
D. making the molecules themselves
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