b Explain why plowing soils might prevent the denitrification of soils 2 marks

B explain why plowing soils might prevent the

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bExplain why plowing soils might prevent the denitrification of soils. (2 marks) IB Biology Higher Level Paper 3 (TZ2) May 2008 QG2 -- ans -- a Mutualism is a close association between two organisms / species where both benefit. 1m Correct example, includes the name of two organisms and description of the manner in which both species benefit. 1m e.g. ruminants and microorganisms in their gut: microorganisms get nutrients or habitat and host gets assistance with digestion b Plowing soils aerates the soils / provides oxygen to the soils. / Bacterial denitrification is an anaerobic process. / Pseudomonas may use oxygen as a substrate / will not use nitrates as substrates in the presence of oxygen. / Plowing may increase drainage which decreases denitrification. (any 2) 1m x 2 -- ans end --
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