Lytle – APES Ch 9 Vocab

Question Answer
autotroph An organism that produces its own food from inorganic compounds and a source of energy. Some use light as an energy source, and some use chemicals such as sulfur as an energy source.
biological production The capture of usable energy from the environment to produce organic compounds in which that energy is stored.
biomass The amount of living material, or the amount of organic material contained in living organisms, both as live and dead material, as in the leaves (live) and stem wood (dead) of trees.
chemoautotrophs Bacteria that can derive energy from chemical reactions of simple inorganic compounds
ecosystem energy flow The movement of energy from an external environment through a series of organisms and back to the external environment.
entrophy A measure in a system of the amount of energy that is unavailable for useful work. As the disorder of a system increases, so does this measure.
gross production Production before respiration losses are subtracted.
heterotrophs Organisms that cannot make their own food from inorganic chemicals and a source of energy and therefore live by feeding on other organisms.
net production Production that remains after utilization. In a pop. sometimes measured as the net change in the # of individuals. Also measured as the net charge in biomass or stored energy. In terms of energy, = the gross production – the energy used in respiration.
photosynthesis Production of sugars from carbon dioxide and water by living organisms using light as energy. Oxygen is given off as a by-product.
primary production The production by autotrophs.
respiration The complex series of chemical reactions in organisms that make energy available for use. Water, carbon dioxide, and energy are the products of this reaction.
secondary production The production by heterotrophs.
thermodynamic system Formed by an energy source, ecosystem, and the energy sink, where the ecosystem is said to be an intermediate system between the energy source and the energy sink.
trophic-level efficiency The ratio of the biological production of one trophic level to the biological production of the next lower trophic level.

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