03:40What Is The Water Cycle | Environmental Chemistry | Chemistry| FuseSchoolFuseSchool - Global Education922views
19:25Chapter 55: Ecosystems and Restoration EcologyMs. Barker's Chemistry & Biology Channel663views1rank
02:07Trophic levels | Producer, primary consumer, secondary consumer, tertiary consumer & decomposersLearn Easy Science1097views
04:06GCSE Biology - Trophic Levels - Producers, Consumers, Herbivores & Carnivores #86Cognito804views
03:27Nitrogen & Phosphorus Cycles: Always Recycle! Part 2 - Crash Course Ecology #9CrashCourse853views
Multiple ChoiceThe biggest difference between the flow of energy and the flow of chemical nutrients in an ecosystem is that __________. 862views
Multiple ChoiceBased on the law of conservation of energy, ecosystem ecologists can make which of the following assertions? 650views
Multiple ChoiceA study of metabolic rates in a terrestrial community showed that the energy released by respiration exceeded the energy captured in photosynthesis. Which of the following situations is most likely? 1093views
Multiple ChoiceWhat are the major factors that control primary production in terrestrial ecosystems? 735views
Multiple ChoiceWhat is the amount of chemical energy in a consumer's food that is converted to its own new biomass over a period of time called? 985views
Multiple ChoiceIn the transition from each trophic level of the food chain to the next trophic level, there is about a __________. 834views
Multiple ChoiceWhich of the following best describes the base of a pyramid of net production? 605views
Multiple ChoiceIn general, the biomass in an ecosystem will be greatest at the trophic level comprising __________. 728views
Multiple ChoiceWhat is the main abiotic reservoir for elements, such as calcium and phosphorus, involved in local biogeochemical cycles? 1026views1rank
Multiple ChoiceIn ecosystems, organisms at the highest trophic levels usually contain less collective biomass than the organisms at lower trophic levels because __________. 1079views
Multiple ChoiceThe global water cycle supports a net flow of atmospheric water vapor __________. 921views
Multiple ChoiceLocal conditions such as heavy rainfall or the removal of plants may limit the amount of nitrogen, phosphorus, or calcium available to a particular ecosystem, but the amount of carbon available to the system is seldom a problem. Why? 950views1rank
Multiple ChoiceBy which process is carbon dioxide released from plants back to the atmosphere? 938views
Textbook QuestionWhich of the following organisms is incorrectly paired with its trophic level? a. cyanobacterium—primary producer b. grasshopper—primary consumer c. zooplankton—primary producer d. fungus—detritivore741views
Textbook QuestionAdd labels to the figure that follows, which illustrates the interacting factors in a declining population that contribute to the extinction vortex.579views
Textbook QuestionWhich of these ecosystems has the lowest net primary production per square meter? a. a salt marsh b. an open ocean c. a coral reef d. a tropical rain forest608views
Textbook QuestionFill in the blanks in the table below summarizing terrestrial nutrient cycles. 550views1rank
Textbook QuestionTrue or False: Most of the net primary productivity that is consumed is used for growth by primary consumers. Explain.569views
Textbook QuestionWhich of the following is the longest-lived reservoir for carbon? a. atmospheric CO2 b. marine plankton (primary producers and consumers) c. fossil fuels d. wood370views
Textbook QuestionNitrifying bacteria participate in the nitrogen cycle mainly by a. converting nitrogen gas to ammonia. b. releasing ammonium from organic compounds, thus returning it to the soil. c. converting ammonium to nitrate, which plants absorb. d. incorporating nitrogen into amino acids and organic compounds.1263views
Textbook QuestionIf you applied a fungicide to a cornfield, what would you expect to happen to the rate of decomposition and net ecosystem production (NEP)? a. Both decomposition rate and NEP would decrease. b. Neither would change. c. Decomposition rate would increase and NEP would decrease. d. Decomposition rate would decrease and NEP would increase.429views
Textbook QuestionDevegetation has what effect on ecosystem dynamics? a. It increases belowground biomass. b. It increases nutrient export. c. It increases NPP. d. It increases soil organic matter.647views
Textbook QuestionWhich of the following has the greatest effect on the rate of chemical cycling in an ecosystem? a. the rate of decomposition in the ecosystem b. the production efficiency of the ecosystem's consumers c. the trophic efficiency of the ecosystem d. the location of the nutrient reservoirs in the ecosystem786views
Textbook QuestionIf the GPP of a grassland is 5000 kcal/m2/year and 55 percent is used up by cellular respiration, what is the NPP? a. 2250 kcal/m2/year b. 2750 kcal/m2/year c. 5000 kcal/m2/year d. need more data934views
Textbook QuestionWhich of the following was a result of the Hubbard Brook watershed deforestation experiment? (A) Most minerals were not recycled within the intact forest ecosystem. (B) Calcium levels remained high in the soil of deforested areas. (C) Deforestation decreased water runoff. (D) The nitrate concentration in waters draining the deforested area became dangerously high.961views
Textbook QuestionExplain why decomposition rates in a field in Nebraska would differ from the decomposition rates in a field in the Amazon. How do decomposers regulate nutrient availability in ecosystems?369views
Textbook QuestionThe Hubbard Brook watershed deforestation experiment yielded all of the following results except which of the following? a. Most minerals were recycled within a forest ecosystem. b. Calcium levels remained high in the soil of deforested areas. c. Deforestation increased water runoff. d, The nitrate concentration in waters draining the deforested area became dangerously high.811views
Textbook QuestionThe web of life refers to the . a. evolutionary relationships among living organisms; b. connections between species in an ecosystem; c. complicated nature of genetic variability; d. flow of information from parent to child; e. predatory effect of humans on the rest of the natural world746views
Textbook QuestionWhich of the following would be considered an example of bioremediation? a. adding nitrogen-fixing microorganisms to a degraded ecosystem to increase nitrogen availability b. using a bulldozer to regrade a strip mine c. reconfiguring the channel of a river d. adding seeds of a chromium-accumulating plant to soil contaminated by chromium938views
Textbook QuestionWhy are the open oceans nutrient poor? Why are coastal areas and intertidal habitats relatively nutrient rich?636views
Textbook QuestionIf you applied a fungicide to a cornfield, what would you expect to happen to the rate of decomposition and net ecosystem production (NEP)? a. Both decomposition rate and NEP would decrease. b. Neither would change. c. Decomposition rate would increase and NEP would decrease. d. Decomposition rate would decrease and NEP would increase.1078views1rank
Textbook QuestionExplain why it is more energy efficient (in terms of the amount of total NPP required) to eat a pound of tofu (bean curd) than a pound of hamburger.420views
Textbook QuestionMost of the nutrients available for plant growth in an ecosystem are . a. deposited in rain; b. made available through the recycling of decomposers; c. maintained within that ecosystem over time; d. B and C are correct; e. A, B, and C are correct697views
Textbook QuestionUse Figures 34.5C and 34.18 to predict how global warming (rapid increase in Earth's average temperature; see Module 7.14) might affect the water cycle.711views
Textbook QuestionAquatic biomes differ in levels of light, nutrients, oxygen, and water movement. These abiotic factors influence the productivity and diversity of freshwater ecosystems. a. Productivity, roughly defined as photosynthetic output, is high in estuaries, coral reefs, and shallow ponds. Describe the abiotic factors that contribute to high productivity in these ecosystems. b. How does extra input of nitrogen and phosphorus (for instance, by fertilizer runoff) affect the productivity of lakes and ponds? Is this nutrient input beneficial for the ecosystem? Explain.877views
Textbook QuestionIn a model of the carbon cycle, how would you label an arrow from the atmosphere to plants?a. cellular respirationb. photosynthesisc. decompositiond. consumption73views
Open QuestionResearchers use models like the business-as-usual model to examine the possible effects of climate change on both terrestrial and aquatic ecosystems. These models are not predictions of our future, but instead allow us to make decisions now to avoid future problems. Provide examples of how society should change to reduce the impact of climate change on our oceans.59views
Textbook QuestionWhich of the following organisms is correctly paired with a trophic level?a. cyanobacterium—secondary consumerb. grasshopper—primary consumerc. zooplankton—primary producerd. grass—decomposer64views
Multiple ChoiceImagine the ecosystem of your local park has gone through a harsh winter, and the total energy contained within the ecosystem is relatively low. To increase the total amount of energy entering the ecosystem, which of the following types of organism could you introduce into the park?89views
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