Biology Option G Review for Exam

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Bio1.Explain the significance of the principle of competitive exclusion. ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... (Total 3 marks)

2.no two species can coexist in same niche;
one is displaced / one survives;
one species has an advantage over competitor /
species compete with each other;
description of (Gause’s) experiments with Paramecium;
[3]

3.Outline the biological consequences of releasing raw sewage into a river. ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... (Total 3 marks)

4.increase in N or P / eutrophication / algal bloom;
increase in bacteria / microbes;
increased BOD / reduced dissolved oxygen;
oxygen sensitive organisms in river die / emigrate /
pollution sensitive organisms increase /
diversity decreases;
increased levels of toxins / hormones / heavy metals;
[3]

5.Compare the roles of Rhizobium and Pseudomonas denitrificans in the nitrogen cycle. ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ............................................................................................................................................... ..................................................................................................................................................
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