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BioUnit3B

edexcel biology terms unit 3B

QuestionAnswer
What is the equation for photosynthesis 6CO2+ 6H20 -> C6h12O6 + 6O2
Productivity is the amount of energy incorporated into the organisms in a trophic level over a given period of time.
Gross primary production is the rate at which the producers transfer light energy into energy in their organic molecules.
Net primary production is (+equation please) the amount of energy available to the consumers, therefore, what is left after the plants have used some. =(gross primary production) - (respiration)
What are the units of productivity kJ m^-2 y^-1
Pyramids of numbers the numbers of organisms at eash trophic level. Are not always informative as they dont take into account the size of the organism.
Pyramids of biomass biomass organisms at eash trophic level. Wet mass is easier to measure but dry mass is more informative as organisms hold different amounts of water.
Pyramids of energy energy contained in organisms per trophic level. More informative than biomass. Total chemical potential energy per organism X total biomass of organisms. Indicates energy transfer between organisms & takes in account energy content of different organism.
Please draw a water cycle, carbon cycle and nitrogen cycle, full labelled and with relavent names of specific bacterium that may be involved: Water: Air, plants, animals, soil, lakes/rivers etc. Carbon: Air, sea, animals, plants, decomposers, rocks, fossil fuels. Nitrogen: Air, rhizobium, azobacter, NH4+ fertiliser, dead remains, NH4+ soil, N02- soil, N03- soil, animals, plants.
Why doesn't all the light enery that enters the ecosystem all transferred to carbohydrate? Lots of light doesnt hit plant leaves. Some light is reflected from surface. Light may pass straight through leaf and not hit chlorophyll molecule in chloroplast. Chlorophyll only absorbs some wavlengths. Some energy is lost as heat during photosynthesis.
Created by: kulhaq
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