Guru charan kumar

IB ESS

2013

SYSTEMS & MODEL WORKSHEET 2
ANSWER SHEET 2
(a)

(i)

900 – 6.6 = 893.4 kcal lost;
893.4
×...
Guru charan kumar

IB ESS

INPUTS
Input

2013

OUTPUTS
Output

food / grass / silage

Impact
possible pollution of
water c...
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Practice sheet system & models 2-asnwer 2

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Practice sheet system & models 2-asnwer 2

  1. 1. Guru charan kumar IB ESS 2013 SYSTEMS & MODEL WORKSHEET 2 ANSWER SHEET 2 (a) (i) 900 – 6.6 = 893.4 kcal lost; 893.4 × 100; 900 = 99.3% loss; Award [2] for correct final answer. (ii) (iii) (b) (i) (ii) 2 there is energy lost from respiration and waste production at each level within a food web; crop production harvests food from lower down in the food web than harvesting fish from the top, therefore it is more efficient; crops capture energy directly from primary source; fish harvesting utilizes a resource that is several steps away from primary production; 2 max heat; respiration; feces; 2 max animals provide a source of protein (essential for the human diet); animals convert vegetation to food that would not be available to humans directly; produce diverse products (milk/meat/blood/wool); taste and culture affect demand; additional benefit that they are working animals; 3 max Award [1] for two inputs. Award [1] for each two associated impacts. Award [1] for two outputs. Award [1] for each two associated impacts. e.g. for milk production
  2. 2. Guru charan kumar IB ESS INPUTS Input 2013 OUTPUTS Output food / grass / silage Impact possible pollution of water courses from fertilisers and effluent Input milk Impact transport of milk and subsequent processing uses fuel and thus has an impact Output waste drugs and supplements Impact drugs may enter human food chain Accept any other reasonable answers. Impact waste may enter water courses and cause enrichment 4 max [13]

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