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Unformatted text preview: C4 pathway differ from those that use the C3 pathway in that at higher temperatures the C4 plants (A) (B) (C) (D) (E) are less productive per unit area of leaf are more productive per unit area of leaf can tolerate lower light conditions better carry on high levels of photorespiration use much more water for transpiration per unit of photosynthesis 85. The amount of energy entering a food chain depends on the (A) direction of energy flow in the system (B) efficiency of energy recycling in the system (C) biomass of carnivores and their efficiency in locating and capturing animal prey (D) biomass of heterotrophs and their efficiency in transforming plant tissue into animal tissue (E) biomass of autotrophs and their efficiency in transforming solar energy into chemical energy 86. Two plant species co-occur in a prairie. Species X always occurs near species Y. However, species Y often occurs in isolation from species X and produces more seeds when alone than when growing next to species X. Which of the following interactions between species X and Y could generate this pattern? (A) Competition, in which Y is superior to X in accumulating resources (B) Mutualism, in which both X and Y benefit by exchanging resources (C) Parasitism, in which X benefits from resources produced by Y and reduces the growth of Y by doing so (D) Commensalism, in which X benefits from resources produced by Y but does not affect the growth of Y by doing so (E) Amensalism, in which X gains no benefit from Y but reduces the growth of Y 87. In the endosymbiont hypothesis for the origin of eukaryotic cells, which of the following is proposed as the role of cyanobacteria? (A) (B) (C) (D) They become the chlorophyll of plant cells. They are the ancestor of mitochondria. They are the ancestor of the chloroplasts. They lose their DNA and become the vacuoles of plant cells. (E) They lose their photosynthetic pigments and become the nuclei of eukaryotes. 83. A lateral root forms on the primary root of a typical herbaceous dicot by (A) continued growth of a root hair on an epidermal cell (B) lateral outgrowth of xylem (C) lateral outgrowth from the root apical meristem (D) activation of a lateral bud at a node on the surface of the root (E) activation of an area in the pericycle to form an apical meristem 84. The leaves of grasses can continue to elongate following mowing or grazing due to actively growing tissue at the base of the leaf blades and sheaths called (A) (B) (C) (D) (E) apical meristems lateral cambium intercalary meristems axillary buds interfascicular parenchyma GO ON TO THE NEXT PAGE.
Unauthorized copying or reuse of any part of this page is illegal. 28 88. The process of speciation can be prevented by (A) (B) (C) (D) (E) genetic differentiation geographical barriers inhibition of gene exchange gene flow behavioral barriers 89. Small body size often allows animals to exploit desert habitats because it (A) decreases the ratio of surface area to volume and hence the tendency to lose water (B) promotes heat gain (C) enhances thermal inertia (D) enables exploitation of favorable microhabitats (E) enables prolonged reliance on internal water stores 90. All of the following are strategies used by pote...
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