Chapter 30: Self-Quiz Why do scientists think that human-induced global warming will be more harmful to plants and animals than were past, natural climate fluctuations? Because temperatures will change faster. Because the temperature changes will be larger. Because species now are less adaptable than species in the past. Because ecosystems are now more complicated than they used to be. Because the temperature changes will last longer. With respect to the carbon cycle, the reservoir for carbon is coal, oil, and natural gas plants CO2 in the atmosphere methane (CH4) in the atmosphere all of the above Why would you expect there to be a smaller biomass of big predators (lions, leopards, hunting dogs, etc.) than of grazing mammals (gazelles, zebras, elephants, etc.) in the African savanna? There is too little cover for the predators to hide in. Due to the inefficiency of energy transfer between trophic levels. Like domestic cats, large predators are susceptible to hair balls. Many predators occur in social groups, thus limiting their numbers. Because grazers are better adapted to moving long distances, they can better follow the rains. What is the one group of organisms that is able to fix atmospheric nitrogen into forms usable by living organisms? plants fungi insects bacteria viruses The biological process by which carbon is returned to its reservoir is photosynthesis denitrification deamination glycolysis cellular respiration As a black widow spider consumes her mate, what is the lowest trophic level she could be occupying? the 3rd trophic level the 1st trophic level the 2nd trophic level the 4th trophic level the 5th trophic level Which of the following statements best describes the movements of energy and nutrients in ecosystems? Energy and nutrients flow through. Energy cycles and nutrients recycle. Energy increases and nutrients cycle. Energy flows through and nutrients cycle. Energy and nutrients cycle. What happens to 99% of the energy that reaches the earth's atmosphere? It is used in photosynthesis. It is destroyed by the atmosphere. It is used as heat by animals. The sun reabsorbs it. It is reflected or absorbed by the atmosphere. The amount of life that can be supported by an ecosystem is determined by the efficiency of the consumers number of producers and their efficiency number of heterotrophs number of chemoautotrophs efficiency of the heterotrophs An herbivore is a primary producer secondary producer primary consumer secondary consumer tertiary consumer Which answer best illustrates the movement of energy through an ecosystem? food chain food web biological magnification nutrient cycles trophic chain Without decomposers and detritus feeders in an ecosystem: Plants would die. Plants would develop nutrient deficiencies. Dead material would accumulate. The soil would get poorer. all of these Biological magnification is associated with which of these toxic materials? DDT mercury radioactive compounds chlorinated hydrocarbons all of these The concentration of carbon dioxide is rapidly increasing in the earth's atmosphere because: The earth is warming. More photosynthesis is occurring. The ozone layer has become much thinner. Human activities are creating it. The oceans are cooling. Plants need nitrogen to synthesize all the following except: amino acids nucleic acids complex polysaccharides vitamins proteins Designed in cooperation with Andrew Stull and Steven Brunasso. Last Update - July 25, 1997 © Prentice-Hall, Inc. A Simon & Schuster Company Upper Saddle River, New Jersey 07458 Legal Statement
Designed in cooperation with Andrew Stull and Steven Brunasso. Last Update - July 25, 1997
Last Update - July 25, 1997
