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Explain the factors that lead to each phase in the sigmoid curve of population growth, making reference, where appropriate, to the role of limiting factors
1 Answer Interpret graphs and diagrams of population growth
1 Answer Identify the lag, exponential (log), stationary and death phases in the sigmoid curve of population growth for a population growing in an environment with limited resources
1 Answer Describe an ecosystem as a unit containing the community of organisms and their environment, interacting together
1 Answer Describe a community as all of the populations of different species in an ecosystem
1 Answer Describe a population as a group of organisms of one species, living in the same area, at the same time
1 Answer 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
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