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State the roles of microorganisms in the nitrogen cycle, limited to: decomposition, nitrification, nitrogen fixation and denitrification (generic names of individual bacteria, e.g. Rhizobium, are not required)
1 Answer Describe the nitrogen cycle with reference to: • decomposition of plant and animal protein to ammonium ions • nitrification • nitrogen fixation by lightning and bacteria • absorption of nitrate ions by plants • production of amino acids and proteins • feeding and digestion of proteins • deamination • denitrification
1 Answer Describe the carbon cycle, limited to: photosynthesis, respiration, feeding, decomposition, formation of fossil fuels and combustion
1 Answer Explain, in terms of energy loss, why food chains usually have fewer than five trophic levels
1 Answer Explain why the transfer of energy from one trophic level to another is often not efficient
1 Answer Discuss the advantages of using a pyramid of energy rather than pyramids of numbers or biomass to represent a food chain
1 Answer Draw, describe and interpret pyramids of energy
1 Answer Identify the following as the trophic levels in food webs, food chains and ecological pyramids: producers, primary consumers, secondary consumers, tertiary consumers and quaternary consumers
1 Answer Describe a trophic level as the position of an organism in a food chain, food web or ecological pyramid
1 Answer Discuss the advantages of using a pyramid of biomass rather than a pyramid of numbers to represent a food chain
1 Answer
Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan