Biological Oxygen Demand (BOD) is a measure of? How much oxygen needed is needed for growth of aerobic bacteria The extent to which rivers or lakes are polluted with inorganic industrial waste compounds How much oxygen is needed for survival of aerobic bacteria The extent to which rivers or lakes are polluted with organic waste compounds

Biological Oxygen Demand (BOD) is a measure of? How much oxygen needed is needed for growth of aerobic bacteria The extent to which rivers or lakes are polluted with inorganic industrial waste compounds How much oxygen is needed for survival of aerobic bacteria The extent to which rivers or lakes are polluted with organic waste compounds

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter46: Ecosystems

Section: Chapter Questions

Problem 3VCQ: Figure 46.17 Which of the following statements about the nitrogen cycle is false? Ammonification...

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Figure 46.17 Which of the following statements about the nitrogen cycle is false? Ammonification converts organic nitrogenous matter from living organisms into ammonium (NH4+). Denitrification by bacteria converts nitrates (NO3-) to nitrogen gas (N2). Nitrification by bacteria converts nitrates (NO3) to nitrites (NO2-). Nitrogen fixing bacteria convert nitrogen gas (N2) into organic compounds.
Figure 20.12 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.
Decomposers are associated with which class of food web? grazing detrital inverted aquatic
Use the words obligate, facultative, aerobic, anaerobic, autotroph, and heterotroph to describe the metabolism of a human, oak tree, E. coli, and Methanococcus jannaschii (an organism that lives in deepwater anoxic sediments).
We have seen that energy is essential for life on earth. All organisms need energy to maintain their cellular processes. There are two basic ways of generating energy de novo, at the base of food webs. Describe the two primary ways that autotrophic organisms generate energy, including the original source of energy and the primary organisms that carry out each process.
Please select the correct sequence of steps involved in the creation of a dead zone in a water body. 1. Heterotrophic microbes metabolize the organic compounds synthesized by primary producers. 2. Water becomes hypoxic and toxic algal blooms may occur; animals in the area either flee or die. 3. Water accumulates nutrients as it runs through agricultural, industrial, and urbanized regions. 4. Dissolved O2 is consumed by metabolic activity of heterotrophs. 5. Excess nitrate and phosphate in nutrient-rich water causes algae and cyanobacteria to flourish. A. 3; 5; 1; 4; 2 B. 3; 1; 4; 2; 5 C. 1; 3; 4; 2; 5 D. 5; 3; 4; 2; 1 E. 3; 5; 2; 1; 4
In Eutrophication, excess nutrients can cause algal blooms. However, what happens when the algae eventually die? Bacterial – Increase or decrease Oxygen – Increase or decrease
Which fraction of phosphorus is available for photosynthetic organisms to directly uptake and use? Organic phosphorus in detritus Absorbed phosphorus in clay Phosphorus in minerals in rocks Soluble phosphorus in water
The following carbon sources can be used for nutrition, by at least some heterotrophic organisms, except: CH3COOH CH3OH CO2 CH4 HCOOH
Why are terrestrial autotrophs responsible more global productivity than marine producers? higher local biomass per unit productivity ocean temperature limit cellular physiology currents stress out the plankton terrestrial CO2 is more accessible for uptake all of the above
State whether the following is True or False of the process of eutrophication from the overuse of fertilizers. Group of answer choices Eutrophication often starts with stimulating algal growth [ Choose ] TRUE FALSE Eutrophication results in loss of dissolved oxygen from the process of photosynthesis [ Choose ] TRUE FALSE It is the decomposition of algae after algal blooms that lead to bacterial growth causing a loss of oxygen [ Choose ] TRUE FALSE Eutrophication is a natural process and can occur in the absence of fertilizers [ Choose ] TRUE FALSE
Regarding nitrogen fixation, are the following statements True or False? a) Atmospheric nitrogen is reduced to the biologically useful form NH3 (or NH4 ). b) Nitrogen fixation in nature and in the lab requires a metal cofactor or catalyst. c) The availability of fixed nitrogen limits biological productivity. d) Ammonium from the atmosphere is fixed to more usable forms of nitrogen, such as nitrite (NO2–). e) Nitrogen fixation is energetically neutral, using a negligible amount of ATP. f) The enzyme nitrogenase, which takes part in nitrogen fixation, is inactivated by oxygen.

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		How much oxygen needed is needed for growth of aerobic bacteria
		The extent to which rivers or lakes are polluted with inorganic industrial waste compounds
		How much oxygen is needed for survival of aerobic bacteria
		The extent to which rivers or lakes are polluted with organic waste compounds