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AQA A Level Biology - Energy and Ecosystems questions and answers 100% verified.

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Where do organic compounds come from in an ecosystem? - correct answer. Plants synthesise organic compounds in photosynthesis using atmospheric or aquatic CO2 What are most of the sugars produced in photosynthesis used for ? - correct answer. Respiration (as respiratory substrates) What are the two uses of organic compounds produced in photosynthesis ? - correct answer. Respiratory Substrates Building other biological molecules e.g. cellulose What is biomass ? - correct answer. The mass of living material or the chemical energy stored (i.e. the biological molecules produced by photosynthesis that aren't respired) What are the two ways in which biomass can be measured? - correct answer. Mass of carbon in a given area, per unit time Dry mass of tissue in a given area, per unit time How can the chemical energy store in dry biomass be measured ? - correct answer. Calorimetry : Burn sample of dry mass (energy released heats water) Change in temperature of water used to determine chemical energy How can the dry mass (biomass) of a tissue be found ? - correct answer. Dry a sample in an oven at a low temperature Weigh at regular intervals until constant mass Why is dry mass used instead of wet mass, as a measure of biomass ? - correc

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