Nitrogen gas returns to the atmosphere by the action of 1. nitrogen fixing bacteria. 2. denitrifying bacteria. 3. nitrifying bacteria. 4. nitrate fertilizers. 82% 14% 4% ize rs . e fe rti l . ni tra t ba c in g ni tri fy ng b tri fy i de ni te r ia . ac te r ia . te ria ba c ng fix i en ni tro g 0% 15 The sequence of energy flow through a food chain is 1. primary consumers- producers- higher order consumers. 2. producers- higher order consumers- primary consumers. 3. higher order consumers- primary consumers- producers. 4. producers- primary consumers- higher order consumers. 15 In a terrestrial ecosystem, the trophic level that would contain the largest biomass would be the 1. producers. 2. primary consumers. 3. secondary consumers. 4. highest order consumers. 5. decomposers. 74% s. po se r om rd e de c hi g he s to co ar y on d 4% r. .. ns ... . .. co ns um se c pr im ar y du ce r s. 4% pr o 11% 7% 15 The study of how living things interact is called: Ecosystems Abiotic factors Ecology The Energy Pyramid 71% 18% 11% Py r. . . lo gy En er gy Ec o Th e Ab i ot ic fa c sy st e to r ... m s 0% Ec o 1. 2. 3. 4. 10 The source of energy for almost all life on Earth is: Fungi Animals Water Sunlight 75% 25% ht Su nl ig W at m al An i er 0% s 0% Fu ng i 1. 2. 3. 4. 15 In an energy pyramid, the bottom level represents: Consumers Producers Scavengers Decomposers 63% 30% 7% De co m po se rs er s ve ng Sc a Pr od u ce r s s 0% Co ns um er 1. 2. 3. 4. 15 An example of a consumer in a pond ecosystem is: Water lily Algae Reed Frog 82% 11% Fr og ed Re ae 0% Al g er lil y 7% W at 1. 2. 3. 4. 15 Which of these food chains is in the correct order? 93% 4% fro g, ... f.. . 0% l, ta i rs at e w ca t na k e, ca te l, ta i ca t er pi ll ar ,c r.. . ... 4% ca t 1. caterpillar, cattail, frog, water snake 2. cattail, caterpillar, frog, water snake 3. water snake, frog, caterpillar, cattail 4. cattail, frog, caterpillar, water snake 15 In an energy pyramid, the lowest level has: 89% 4% ea m sa th e m or e en er gy th ... m ou n. .. 0% th . .. ne rg y ss e le ss e ne rg y th . .. 7% le 1. less energy than the top level 2. less energy than the second level 3. more energy than the top level 4. the same amount of energy as the second level 15 A food chains shows: 1. one possible pathway for energy 2. many possible pathways for energy 3. the amount of energy available to a producer 4. the amount of energy available to a consumer 64% 29% 7% f. .. th e am ou nt o ou am th e nt o f. .. . .. le os sib m an yp on e po ss ib le p. .. 0% 15 Decomposers are important to ecosystems because they: 75% 18% t. .. igh tl ve r co n ak e m ng e nu t sim rie pl e nt s.. . ... hi g ch a at ar e 4% .. . 4% th e 1. are at the highest level of the energy pyramid 2. change simple compounds into more complex ones 3. make nutrients available for producers to reuse 4. convert light energy into sugars through photosynthesis 15 Two examples of decomposers are: 1. fungi and bacteria 2. algae and marine mammals 3. carnivores and herbivores 4. ferns and mosses 96% 4% os s.. . fe rn s an d m an or es ni v ca r an d ae alg 0% d. .. i.. . m ar t. . . ba c nd fu ng ia 0% 15 A caterpillar eats a leaf, and a bird eats the caterpillar. In this interaction, the bird is a: Producer Herbivore Primary consumer Secondary consumer 79% 11% 11% on s.. . ry c on da ar y Pr im Se c co ns um . .. vo re He rb i ce r 0% Pr od u 1. 2. 3. 4. 15 How is a food web model different from a food chain? 88% n eb ,a w In a In a w eb ,e eb ,a n o. .. 0% o. .. ne r. . . 4% w a In In a w eb ,e ne r. . . 1. In a web, energy moves from an organism to only one other. 2. In a web, energy may move to many organisms from one. 3. In a web, an organism gets energy from one source. 8% 4. In a web, an organism receives less energy than in a chain. 15 An unusually cold winter causes the squirrel population to decrease. This is an example of temperature as a: 1. Carrying capacity 86% 2. Limiting factor 3. Climax community 4. Pattern in space sp a. .. . 0% un i.. Pa t te r n in m co m Cl im ax fa ct Lim it i ng ca p ng ry i Ca r 7% o. .. ac . .. 7% 15 An animal that eats only plants is a: 1. Primary consumer 2. Secondary consumer 3. Tertiary consumer 4. Primary producer 86% 11% 4% ce r er pr od u ar y Pr im Te rti a ry co ns um on su m er ry c nd a Se co Pr im ar y co ns um er 0% 15 A snake that eats an insect-eating frog is a: 1. Primary consumer 2. Secondary consumer 3. Tertiary consumer 4. Primary producer c.. . pr od u Pr im ar y co ns u. .. Te rti a ry on s.. . ry c nd a Se co Pr im ar y co ns um . .. 25% 25% 25% 25% 15 Which of the following is difference between the nitrogen and carbon cycles? 1. Nitrogen can exist as a solid but carbon cannot. 2. Carbon is released through decomposition but nitrogen is not. 3. Carbon is released through respiration but nitrogen is not. 4. Carbon is cycled through animals but nitrogen is not. 93% 4% cy c l. .. le ... Ca r bo n is re Ca r bo n is bo n Ca r is re e. .. ca n en Ni tro g 0% le ... 4% 15 Which of the following makes the nitrogen cycle unique? 46% 43% 7% ... en Ni tro g Ni tro g en is is en Ni tro g re qu i al ... fo . .. 4% y. .. on l he st It i 1. It is the only nutrient cycle without a gas 2. Nitrogen is always only a liquid 3. Nitrogen is found in plants, animals and the soil 4. Nitrogen requires specific bacteria for its cycle 15 Which of the following correctly traces the path of a raindrop through the water cycle? 1. precipitation, run-off, evaporation, condensation 2. precipitation, condensation, run-off, evaporation 3. precipitation, evaporation, run-off, condensation 4. precipitation, evaporation, condensation, run-off 46% 29% 14% n, . .. pr e c ip it a tio n, . .. pr e c ip it a tio n, . .. tio c ip it a pr e pr e c ip it a tio n, . .. 11% 15 Which of the following is a way carbon is added to the atmosphere? 1. Evaporation of water 25% 25% 25% 25% 2. Forest fires f.. . of io n Fo rm at sy nt he s is fir es Fo re st Ph ot o Ev a po r at io n of ... 3. Photosynthesis 4. Formation of fossil fuels 15 Why are legumes such as peas and alfalfa considered good for soil? 59% 30% 7% ni es Th ey ha ve av le Th ei r b bs or Th ey a tr. .. a. .. a. .. 4% w a. .. va lu d ad Th ey 1. They add valuable humus to the soil when they die and decay. 2. They absorb water and help control runoff. 3. Their leaves are able to photosynthesis at a very high rate. 4. They have nitrogen fixing bacteria in their roots. 15 Where is the oxygen we breathe produced? 1. in the rocks 2. by decaying organisms 3. during photosynthesis 4. as water evaporates 96% po ... as wa t er e va ho to sy .. . du rin ay in ec by d gp go r.. ro c th e in 4% 0% . ks 0% 15 What is the major factor that limits the number and types of plants that can grow in Utah? 1. the amount of rainfall we receive 2. the number of people living Utah 3. the types of animals found in Utah 4. the location of Utah on the continent 67% 11% o. .. a. .. n tio ca lo th e th e ty pe s be r m nu th e 7% of of ... f. .. nt o ou am th e 15% 15 Which of the following is a way carbon dioxide can be removed from the air? building dams fertilizing crops mining coal planting trees 78% 15% 7% gt re es oa l pl a nt in gc m in in ng izi fe rti l ld in gd am s cr . .. 0% bu i 1. 2. 3. 4. 15