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18 Cards in this Set

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35. Define decomposer.
Decomposers are organisms that get energy by breaking down the remains of dead organisms
36. Why should there be many more prairie dogs than coyotes in a prairie ecosystem? (Short Answer)
It takes many prairie dogs to support just one coyote since very little energy is transferred to the coyote when it eats the prairie dog. So it takes a large number to support an entire population of coyotes.
37. In the antarctic ecosystem, what animal are krill a source of food?
COD, penguin, crabeater seal
38. Give an example of a food chain.
Algae>>>Krill>>>Cod>>>Seal>>>>Whale
39. Energy in a food chain flows from one organism to another as each organism
____________________________________.
Eats the one below it.
40. How does a decomposer respond to biomass? (Short Answer)
Decomposers break down biomass in a process called decay. During decay, decomposers break down biomass, releasing energy and stored nutrients.
29. Energy is ______________ at each level of an energy pyramid.
Lost
30. When a mouse hides under a rock during a rainstorm, what part of its environment is it responding to?
Nonliving
31. What do fungi and other decomposers break down?
Biomass
32. As decomposers break down the remains of other organisms, what do they put back into the ecosystem?
Nutrients
33. What does a grass plant use most of the energy it gets from the sun on?
Its own life processes
34. How do decomposers benefit an ecosystem?
Decomposers benefit an ecosystem by
1. Returning nutrients to the soil and
2. Breaking down dead organisms.
23. What do food webs show?
Food webs show that energy flows in many ways through an ecosystem
24. Name 2 nonliving parts of an ecosystem to which organisms may respond.
1. Air temperature
2. Rain
25. What links together in a community to form food webs?
Food chains
26. Name three things that that organisms can respond to.
1. Other organisms
2. The nonliving environment
3. Themselves
27. The amount of available energy becomes __________________ at each higher level in a food chain.
Smaller
28. If you yawn when you are tired, what type of stimulus are you responding to?
Internal stimulus