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Download Ecosystem changes PPQs (a) Define the term species
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Ecosystem changes PPQs Define the term species. ...................................................................................................................................... ...................................................................................................................................... (1) A grasses mosses and lichens dicotyledons B dicotyledons with root nodules -------------------------- The figure below shows the vegetation change over time. -------------------------- (a) C deciduous woodland oak and birch scrub Time [J L Chapman and M J Reiss, Ecology: Principles and Applications (1999). © Cambridge University Press] (b) (i) State the name of the process shown in the diagram above. ........................................................................................................................... (1) (ii) Outline what is meant by the term climax vegetation and identify which part of the diagram above (A, B or C) contains climax vegetation. ........................................................................................................................... ........................................................................................................................... ........................................................................................................................... (2) (iii) Suggest two ways in which human activity could affect climax vegetation. ........................................................................................................................... ........................................................................................................................... ........................................................................................................................... ........................................................................................................................... (2) (c) (i) Draw “S” and “J” population growth curves on the axes below. Label each graph and the axes. (2) (ii) Identify in which part of the diagram above (A, B or C) you would expect to find species with S population growth curves. .................................... J population growth curves. .................................... (2) (d) Animals adopt a range of reproductive strategies. (i) Outline the characteristics of K-strategy organisms and give an example of such an organism. ........................................................................................................................... ........................................................................................................................... ........................................................................................................................... ........................................................................................................................... (2) (ii) Outline the characteristics of r-strategy organisms and give an example of such an organism. ........................................................................................................................... ........................................................................................................................... ........................................................................................................................... ........................................................................................................................... (2) (Total 14 marks)
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