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Ecology

Test Description: Ecology, food webs, carbon & nitrogen cycles, population growth

Instructions: Answer all questions to get your test result.

1) How much energy is lost between levels of a food pyramid?

A10% B90% C99% DAbout half

2) Why are there usually only 4 or 5 links in a food chain?

AThere is not enough energy available to support numerous top-level predators BDecomposers produce the energy CConsumers compete in similar niches DHerbivores consume about 50% of the energy in an ecosystem

3) Living things that convert the sun's energy into chemical energy for other organisms are called:

AProducers BSecondary consumers CPrimary consumers DHerbivores

4) Which one of the following ecological roles is the most numerous in an ecosystem?

ACarnivores BProducers CDecomposers DConsumers

5) What is an environment's carrying capacity?

ANumber of organisms that compete with each other for resources BNumber of producers needed to support an environment CHighest number of organisms that can an ecosystem can support for an extended period DHighest number of organisms in a population at one time

6) What is the role of bacteria in the nitrogen cycle?

AReducing the amount of ammonia in the soil BIncreasing levels of nitrogen in consumers CIncreasing photosynthesis in plants DConverting atmosphereic nitrogen to a more usable form for plants

7) Burning of fossil fuels has led to...

Aan increase in nitrogen levels Ba decrease in global carbon levels Can increase in global carbon levels Dsilky, manageable hair

8) Abiotic factors include:

Asunlight Ball answers are correct Ctemperature Delements & minerals

9) Biotic factors are defined as:

Aonly the producers & decomposers in an environment Bthings that were alive at one time Cthe main parts of the carbon cycle Dliving things in an environment

10) Examples of biotic factors include...

Aavailabilty of carbon & nitrogen Bbacteria & fungi Catmospheric conditions Dsoil

*select an answer for all questions

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