22 True or False. Oxygen is sometimes considered to be one of two master variabl

Question

22 True or False. Oxygen is sometimes considered to be one of two master variables, along with oxidation-reduction potential, because of its interaction in respiration and photosynthesis.

a. True b. False

23. True or False. Lake Superior has the largest surface area of any freshwater lake on earth.

a. True b. False

24. True or False. Lakes formed by glaciers include the Great Lakes as well as calderas and oxbows.

a. True b. False

25. True or False. A negative heterograde dissolved oxygen distribution may occur when a warm inflow with low oxygen concentrations enters a stratified lake and inserts itself below the warmer depths.

a. True b. False

26. The two most important determinants of habitat in freshwater ecosystems are

a. temperature and dissolved oxygen

b. pH and dissolved oxygen (surrogate for pE)

c. oxidation-reduction potential and dissolved oxygen

d. temperature and oxidation-reduction potential

e. pH and oxidation-reduction potential

Explanation / Answer

22.True - Photosynthesis makes the glucose that is used in cellular respiration to make ATP. The glucose is then turned back into carbon dioxide, which is used in photosynthesis.Without oxygen, much less ATP would be produced. Cellular respiration and photosynthesis are important parts of the carbon cycle.

23.True - It's the world's largest freshwater lake by surface area – 82,100 square kilometres, or roughly the size of Maine – and holds 10 percent of the world's surface fresh water.

24.False -  The Great Lakes in the U.S. and Canada are well-known examples of lakes produced by multiple glaciations and deepened by glacial scouring.But A crater lake is a lake that forms in a volcanic crater or caldera. And An oxbow lake is a U shaped body of water that forms when a wide meander from the main stem of a river is cut off, creating a free-standing body of water.

25. True - Temperature and Dissolved Oxygen -Water temperature is one of the most important characteristics of an aquatic system, affecting: Dissolved oxygen levels. The solubility of oxygen decreases as water temperature increases. Chemical processes. Temperature affects the solubility and reaction rates.

26. Tempreture and dissolve oxygen - Freshwater ecosystems are a subset of Earth's aquatic ecosystems. They include lakes and ponds, rivers, streams, springs, and wetlands.Freshwater habitats can be classified by different factors, including temperature, light penetration, and vegetation, oxygen.Water temperature plays a major role in the quality of aquatic life and habitats. Heat flow and .The effect that temperature has on ORP values depends on the chemical species (atoms, molecules and ions) present in the solution

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