chapter 55 - A) Matter is cycled through ecosystems; energy...

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1) How are matter and energy used in ecosystems? A) Matter is cycled through ecosystems; energy is not. 2) A cow's herbivorous diet indicates that it is a(n) A) primary consumer. 3) To recycle nutrients, the minimum an ecosystem must have is B) producers and decomposers. 8) What is the most important role of photosynthetic organisms in an ecosystem? A) converting inorganic compounds into organic compounds 9) Ecosystems are B) processors of matter and transformers of energy. If the Sun were to suddenly stop providing energy to Earth, most ecosystems would vanish. Which of the following ecosystems would likely survive the longest after this hypothetical disaster? C) benthic ocean 12) Which of the following is true of detrivores? They convert organic materials from all trophic levels to inorganic compounds usable by primary producers. Subtraction of which of the following will convert gross primary productivity into net primary productivity? C) the energy used by autotrophs in respiration Which of these ecosystems accounts for the largest amount of Earth's net primary productivity D) open ocean 18) Which of these ecosystems has the highest net primary productivity per square meter? D) tropical rain forest How is it that the open ocean produces the highest net primary productivity of Earth's ecosystems, yet net primary productivity per square meter is relatively low? C) Oceans have the greatest total area. 21) Aquatic primary productivity is most limited by which of the following? A) light and nutrient availability 22) Aquatic ecosystems are least likely to be limited by which of the following nutrients? carbon
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As big as it is, the ocean is nutrient-limited. If you wanted to investigate this, one reasonable avenue would be to experimentally enrich some areas of the ocean and compare their productivity to that of untreated areas A porcupine eats 3,000 J of plant material. 1,600 J is indigestible and is eliminated as feces. 1,300 J are used in cellular respiration. What is the approximate production efficiency of this animal? C) 3% Which of the following lists of organisms is ranked in correct order from lowest to highest percent in production efficiency? A) mammals, fish, insects 30) Trophic efficiency is B) the percentage of production transferred from one trophic level to the next. In general, the total biomass in a terrestrial ecosystem will be greatest for which trophic level? producers For most terrestrial ecosystems, pyramids of numbers, biomass, and energy are essentially the same-they have a broad base and a narrow top. The primary reason for this pattern is that B) at each step, energy is lost from the system as a result of keeping the organisms alive. Which of the following is primarily responsible for limiting
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This note was uploaded on 03/31/2011 for the course BIO 101 taught by Professor Siller during the Spring '10 term at University of Minnesota Duluth.

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chapter 55 - A) Matter is cycled through ecosystems; energy...

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