1) What does a pyramid of numbers show? a) The number of organisms at each trophic level. b) The number of organisms in each community. c) The number of organisms over a period of time. 2) What does a pyramid of biomasss show? a) The amount of organic material at each trophic level. b) The amount of organic material in each community. c) The amount of organic material at each trophic level per unit area. 3) What does a pyramid of energy show? a) The amount of energy in each community. b) The amount of energy at each trophic level. c) The amount of energy in a poulation per unit time and area. 4) In what form is most energy lost from within an organism? a) Heat b) Kinetic c) Chemical 5) How can energy be consumed (but not assimilated) be lost? a) Excretion b) Movement c) Egestion 6) What can most energy loss within an organism be simplified to? a) Movement b) Respiration c) Excretion 7) In what form is energy passed along a food chain? a) Chemical bond energy b) Heat energy c) Biomass 8) Why might energy absorbed by a plant not be available to the primary consumer? a) It is the wrong wavelength b) The plant releases the energy via respiration and uses it in active processes c) The plant uses the enrgy to build organic molecules 9) Why might energy within organic material not be passed to the next trophic level? a) It is released as heat b) The consumer uses it to synthesise new cells. c) Not all of the organism will be eaten 10) Which of the following is not a reason for energy loss within an organism? a) Heat loss. b) Movement c) Synthesis of cells d) Excretion

Y13 energy flow

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