Chapter 41

Decomposers are commonly ______. a. fungi b. animals c. bacteria \(\quad\) d. a and \(c\)

Primary productivity on land is affected by ______. a. nutrient availability b. amount of sunlight c. temperature d. all of the above

If biological magnification occurs, the ______ will have the highest levels of toxins in their systems. a. producers b. herbivores c. primary carnivores d. top carnivores

Disruption of the ______ cycle is depleting aquifers. a. hydrologic b. carbon c. nitrogen d. phosphorus

Earth's largest carbon reservoir is ______. a. the atmosphere b. sediments and rocks c. seawater d. living organisms

The _______ cycle is a sedimentary cycle. a. hydrologic b. carbon c. nitrogen d. phosphorus

______ is often a limiting factor for plant growth. a. Nitrogen b. Carbon c. Phosphorus d. both a and \(c\) e. all of the above

Nitrogen fixation converts ______ to ______. a. nitrogen gas; ammonia b. nitrates; nitrites c. ammonia; nitrogen gas d. ammonia; nitrates e. nitrites; nitrogen oxides

Match the terms with suitable descriptions. ______ producers _____ herbivores _____ decomposers ______ detritivores a. feed on plants b. feed on small bits of organic matter c. degrade organic wastes and remains to inorganic forms d. capture sunlight energy