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Chapter 46: Q. 26 (page 1369)
Compare and contrast food chains and food webs.
What are the strengths of each concept in describing ecosystems?
Food chain is very easy to use beacuse it is a linear description whereas food webs needs an accurate structure of the organism
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Compare grazing and detrital food webs. Why would they both be present in the same ecosystem?
Which of the following statements about the nitrogen cycle is false?
a. Ammonification converts organic nitrogenous matter from living organisms into ammonium (NH4 + ).
b. Denitrification by bacteria converts nitrates (NO3 − ) to nitrogen gas (N2 ).
c. Nitrification by bacteria converts nitrates (NO3 − ) to nitrites (NO2 − ).
d. Nitrogen fixing bacteria convert nitrogen gas (N2 ) into organic compounds.
Carbon is present in the atmosphere as ________. a. carbon dioxide b. carbonate ion c. carbon dust d. carbon monoxide
The weight of living organisms in an ecosystem at a particular point in time is called: a. energy b. production c. entropy d. biomass
The loss of an apex consumer would impact which trophic level of a food web? a. primary producers b. primary consumers c. secondary consumers d. all of the above .
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