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Free CLEP Science and Mathematics Exam Braindumps (page: 23)

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In an aquatic environment, oxygen concentration depends on chemical and physical factors and is greatly affected by many biological processes. These is much less dissolved oxygen (DO) in aquatic environments than in dry air. In most aquatic environments, there are only 5 to 10 mL of dissolved oxygen in a liter of water. Chemical and physical factors, such as salinity, pH, and especially temperature, can affect the DO concentration and distribution. An experiment was done to study the effect of different salinity levels on DO in water of varying temperatures. The results are below. Salinity is expressed in parts per thousand (ppt) and is the content of dissolved salt in water.


The term "Dissolved Oxygen" refers to the oxygen that is dissolved in which of the following substances before it can be used by aquatic plants and animals?

  1. water
  2. ammonia
  3. salt
  4. blood
  5. carbon dioxide

Answer(s): A

Explanation:

The experiment is about measuring the oxygen content in the water. Oxygen must be dissolved in water to be used by plants and animals. It cannot be bound to other molecules, and must exist in its free state (as O2) to be utilized.



In an aquatic environment, oxygen concentration depends on chemical and physical factors and is greatly affected by many biological processes. These is much less dissolved oxygen (DO) in aquatic environments than in dry air. In most aquatic environments, there are only 5 to 10 mL of dissolved oxygen in a liter of water. Chemical and physical factors, such as salinity, pH, and especially temperature, can affect the DO concentration and distribution. An experiment was done to study the effect of different salinity levels on DO in water of varying temperatures. The results are below. Salinity is expressed in parts per thousand (ppt) and is the content of dissolved salt in water.


The results of the experiment suggest that at salinities of greater than 30 ppt, it is likely that

  1. dissolved oxygen levels would increase
  2. water temperature would increase
  3. aquatic organisms would begin to die
  4. there would be no change in dissolved oxygen
  5. the amount of dissolved oxygen would decrease

Answer(s): E

Explanation:

Although the graph shows results only for salinities ranging from 0 ppt to 30 ppt, one could extrapolate that salinities of greater than 30 ppt would show curves on the graph lower than the curve of 30 ppt. In other words, as salinity increases, dissolved oxygen would get lower and lower.



In an aquatic environment, oxygen concentration depends on chemical and physical factors and is greatly affected by many biological processes. These is much less dissolved oxygen (DO) in aquatic environments than in dry air. In most aquatic environments, there are only 5 to 10 mL of dissolved oxygen in a liter of water. Chemical and physical factors, such as salinity, pH, and especially temperature, can affect the DO concentration and distribution. An experiment was done to study the effect of different salinity levels on DO in water of varying temperatures. The results are below. Salinity is expressed in parts per thousand (ppt) and is the content of dissolved salt in water.




The oxygen that is dissolved in the water is used by aquatic organisms for

  1. photosynthesis
  2. cellular respiration
  3. digestion
  4. dehydration synthesis
  5. chemosynthesis

Answer(s): B

Explanation:

The sole function of oxygen is to power the mitochondria so that they can produce ATP via cell respiration.



Twenty-five ficus plants were placed in each of four closed containers and then exposed to light of specific colors as shown in the data table. All other environmental conditions were held constant for a period of 3 days. At the beginning of the investigation, the quantity of CO2 present in each closed container was 220 cubic centimeters. The data table shows the amount of CO2 remaining in each container at the end of 3 days.


The color of light that seems best for photosynthesis in ficus plants is

  1. blue
  2. red
  3. green
  4. orange
  5. All colors tested were equivalent.

Answer(s): B

Explanation:

Because the amount of carbon dioxide used is an indicator of the rate of photosynthesis, the plants in the red-light group show the greatest rate of photosynthesis. Carbon dioxide levels began at 220 cm3 at the start of the experiment, and they dropped to 50 cm3 in the red-light group. No other group used up as much carbon dioxide.






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