5 February 2012, 9:22 am
15. Mallory has four aquatic plants of the same size and species. She submerges each plant in a separate beaker filled with 200 mL of water. She then sets each beaker under a different intensity of light. Mallory observes that, of the four plants, the plant in the beaker under the most intense light gives off the most gas bubbles in a 20 min period. Which of the following statements best explains Mallory’s observations? A. Cells decompose most quickly under the most intense light. B. Water evaporates from plants fastest under the most intense light. C. Photosynthesis occurs at the highest rate under the most intense light. D. Gases in the leaves of plants expand most under the most intense light. 16. Which of the following processes releases primarily oxygen into the atmosphere? A. combustion B. osmosis C. photosynthesis D. respiration 17. The diagram at right shows part of the carbon cycle. If many trees are removed from a forest by logging, what is the most immediate effect on the carbon cycle in that forest? A. increased rates of decomposition B. decreased use of atmospheric CO2 C. decreased combustion of fossil fuels D. increased production of organic compounds 18. Many land plants store energy in starch. When energy is needed, the starch molecules can be broken down quickly. This chemical reaction produces which of the following? A. amino acids B. lipids C. monosaccharides D. RNA chains 19. Many plants have waxy coatings on some surfaces. This coating reduces water loss because it is not water-permeable. This waxy coating is which of the following types of organic molecule? A. carbohydrate B. lipid C. nucleic acid D. protein 20. In one of the steps of the carbon cycle, a person exhales a molecule of carbon dioxide (CO2) into the atmosphere. Which of the following is most likely to happen next to the atom of carbon in this molecule? A. It may be used as part of a sugar in a plant. B. It may become part of a protein in an animal. C. It may be consumed as a fossil fuel is burned. D. It may be decomposed into carbon and oxygen by a bacterium. 21. Which of the following is more likely to occur in a plant cell than in an animal cell? A. synthesis of enzymes B. formation of cellulose C. breakdown of glucose D. active transport of ions 22. Which of the following occurs during photosynthesis? A. CO2 is used to produce water. B. CO2 is absorbed by mitochondria. C. CO2 and H2O are converted to carbohydrates. D. CO2 and H2O are combined into carbonic acid. 23. In which of the following ways are photosynthesis and cellular respiration alike? A. Both processes produce glucose. B. Both processes consume carbon dioxide. C. Both processes take place in chloroplasts. D. Both processes involve energy transformations. 24. The amount of water a plant has in its tissues is determined primarily by the balance of which of the following processes? A. runoff and root absorption B respiration and photosynthesis C. precipitation and photosynthesis D. root absorption and transpiration... Read More »
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