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Free CLEP Science and Mathematics Exam Braindumps (page: 24)

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PDF with 494 Questions

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 one color of light missing from the experimental data that would provide a suitable control group is

  1. orange
  2. indigo
  3. violet
  4. white
  5. yellow

Answer(s): D

Explanation:

While light, which is made up of all of the colors of the rainbow (ROYGBIV), is missing. Without a white light group, it is hard to have a baseline of how a "normal," control plant population might do in regular, everyday light.



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.



A graph plotted of the experimental results would most closely resemble which of the following?


  1. Option A
  2. Option B
  3. Option C
  4. Option D
  5. Option E

Answer(s): E

Explanation:

The proper plot shows the independent variable (light color) on the x-axis plotted against the dependent variable (carbon dioxide concentration remaining) on the v- axis. The best type of graph to use is a histogram because you have collected data for specific colors of light only. You have no information about the other colors or carbon dioxide use at times other than at the very end of the experiment. Thus, using a line graph forces you to make up information about other colors of light or time periods that you do not have.



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.



Which of the following is best explanation for the fact that 200 cm3 of CO2, remained in the green light group after three days'?

  1. The plants absorbed a green light for photosynthesis.
  2. The plants reflected the green light and did not use it for photosynthesis.
  3. Carbon dioxide is produced as a waste product of photosynthesis.
  4. The green light was converted into other wavelengths as it was absorbed.
  5. Carbon dioxide built up as a by-product of cell respiration.

Answer(s): B

Explanation:

Objects in the natural world appear the color they do because of the light waves they reflect. Green objects look green to us because they reflect green light. Hence, green light should be the worst light for plants to use for photosynthesis, as shown in the experimental data.



Duchenne muscular dystrophy (DMD) is a sex-linked recessive disorder that results in a degenerative disease of the muscles of the body. As muscles gradually deteriorate, patients lose the ability to control the muscles and eventually die as breathing muscles are rendered useless. An extended family was studied over several generations and the incidence of DMD was followed as indicated in the pedigree below.


Using the lower case letter d as the recessive allele for DMD, what is the genotype of the individual labeled "C" in the pedigree?

  1. XdXd
  2. XY
  3. XX
  4. XdX
  5. XdY

Answer(s): E

Explanation:

Individual C is a male, as seen by the square on the pedigree. Males are XY to start, and if a sex-linked allele were present, such as the allele for DMD, it would be found on his lone X chromosome ­ thus, XdY.






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