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WJEC - A/AS Level A level Biology
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| 2.6 | Human activities can impose far reaching effects on the environment. | (a) Agricultural exploitation. Conflicts between production and conservation as illustrated by: 1. forests: reasons for forest destruction, consequences, managed forests. 2. oceans: the problems of over-fishing and attempts at regulation as illustrated by the principle of quotas, exclusion zones and restricted net mesh size. (b) The principles of chemical and biological control of pests and their relative advantages and disadvantages, The use of pyrethroids to control pest insects in agriculture and the parasite Encarsia formosa to control the glasshouse white fly Trialeuroides vaporariorum. The effects of human activities on the carbon cycle. Economic importance of the nitrogen cycle in relation to food production and fertiliser application. | 6 |
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