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1 Created by Boundless Organisms that can make their own food using inorganic molecules are called _____, while organisms that make their own food using light energy are called _____. A chemoautotrophs; photoautotrophs B heterotrophs; chemoautotrophs C photoautotrophs; chemoautotrophs D heterotrophs; photoautotrophs 2 Created by Boundless The rate at which photosynthetic primary producers incorporate solar energy is referred to as ______, while the energy that remains in the primary producers following respiration and heat loss is referred to as ______. A gross primary productivity; net primary productivity B photoautotrophy; chemoautotrophy C biomass; gross primary productivity D net primary productivity; gross primary productivity 3 Created by Boundless Which of the following about the energy transfer between trophic levels is true? A Endotherms utilize energy more efficiently than ectotherms. B Energy can only be transferred once within a food chain. C There is an infinite number of energy transfers within a food chain. D Ectotherms utilize energy more efficiently than endotherms. 4 Created by Boundless Fill in the blank. Ecological/trophic pyramids are a good way to illustrate energy needs in an ecosystem. This is because the energy is ______ as it passes from one trophic level to the next. A lost B constant C gained and then lost D gained 5 Created by Boundless The English Channel ecosystem has an inverted shape because the ______. 6 A primary producers have a low turnover rate B lack of productivity of primary producers C primary producers have a high turnover rate D primary consumers have a high turnover rate Created by Boundless Why do grasslands typically exhibit an upright pyramid shape during the summer? A There are more primary consumers than primary producers. B There are more primary producers than primary consumers. C The number of organisms increases at each trophic level. D Organisms at the top of the pyramid are subject to greater predation. 7 Created by Boundless Which of the following is a result of biomagnification? A organisms at the highest trophic levels accumulate the greatest amount of toxic substances B all of these answers C toxic substances are brought through the ecosystem by the apex consumers D organisms at the lowest trophic levels are unaffected by toxic substances