Concepts of Biology
1st Edition
ISBN: 9781938168116
Author: Samantha Fowler, Rebecca Roush, James Wise
Publisher: OpenStax College
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Textbook Question
Chapter 20, Problem 3RQ
Decomposers are associated with which class of food web?
a. grazing
b. detrital
c. inverted
d. aquatic
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Which essential chemical must be “fixed” by soil-dwelling bacteria before it can enter the food chain?
a. Carbon
b. Nitrogen
c. Phosphorous
d. Both a. and b.
Why are decomposers usually absent from food webs?
A. Decomposers do not have a feeding relationship with other organisms
B. Decomposers can operate at several different trophic levels
C. Decomposers can produce their own food
D. Decomposers can only access energy from dead organisms
What group of organisms make their own food?
A. Autotrophs
B. Producers
C. Phototrophs
D. All of the options are correct.
Chapter 20 Solutions
Concepts of Biology
Ch. 20 - Figure 20.12 Which of the following statements...Ch. 20 - Figure 20.28 In which of the following regions...Ch. 20 - Decomposers are associated with which class of...Ch. 20 - The producer in an ocean grazing food web is...Ch. 20 - Which term describes the process whereby toxic...Ch. 20 - The majority of the water found on Earth is: a....Ch. 20 - The process whereby oxygen is depleted by the...Ch. 20 - Which of the following biomes is characterized by...Ch. 20 - Which of the following biomes is characterized by...Ch. 20 - Why is the tundra treeless? a. lack of sufficient...
Ch. 20 - Where would you expect to find the most...Ch. 20 - A key feature of estuaries is a. low light...Ch. 20 - Compare grazing and detrital food webs. Why would...Ch. 20 - Why are drinking water supplies still a major...Ch. 20 - The extremely low precipitation of subtropical...Ch. 20 - In what ways are the subtropical desert and the...Ch. 20 - Describe the conditions and challenges facing...
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- In the upper portions of the soil, which organism would you expect to have the least number? A. Fungi B. Algae C. Anaerobic bacteria D. Aerobic bacteriaarrow_forwardWhat process brings nitrogen from the atmosphere into living system? A. Methanogenesis B. Denitrification C. Anammox D. Nitrogen fixation E. Nitrificationarrow_forwardWhich of the following is a process of the nitrogen cycle that involves the conversion of nitrogen gas to ammonia? a.Nitrogen fixation b.Nitrification c.Ammonification d.Denitrificationarrow_forward
- How can primary sewage treatment be used as a source of biofuel? a.Fermentation of BOD allows ethanol to be produced b.After primary treatment, the water is clean enough to use for hydrogen fuel c.Lipids that collect on the surface can be collected for biodiesel d.The trickling filters captures sludge that can be used for hydrogen fuelarrow_forwardChoose the best below ? Decomposers a. break down dead organic matter in the environment by secretingdigestive enzymes.b. break down living organic matter by secreting digestive enzymes.c. destroy living cells and then break them down with digestiveenzymes.d. live in close association with another species.arrow_forwardWhich of the following items could not be used as food by living organisms? A. Twinkies B. Mushrooms C. Aluminum D. Leavesarrow_forward
- Which nutrient moves into plants during primary production? a.phosphorus b. nitrogen c. carbon d. none e. all threearrow_forwardWhat genus of bacteria transforms ammonia to nitrite in the Nitrogen cycle? A. Nitrobacter B. Nitrosomonas C. detritus D. Legumesarrow_forwardNitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false? A. By cyanobacteria B. By electrical discharges in the atmosphere C. By industrially synthesised fertilizer D. By denitrificationarrow_forward
- Which trophic level is vital to the continuation of the carbon cycle? Group of answer choices a. tertiary consumer b. secondary consumer c. producer d. primary consumerarrow_forwardExplain the effect of dumping untreated sewage into a pond on the eutrophication of the pond. A. The effect of sewage that has primary treatment? B. The effect of sewage that has secondary treatment? C. Contrast your previous answers with the effect of each type of sewage on a fast-moving waterarrow_forwardIn the context of the phosphorous cycle, which of the following processes is indicated by arrow ac? A. Erosion B. Convection C. Transpiration D. Evaporation E. Nitrogen fixationarrow_forward
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