From the food chain (cereals – “grasshoppers -” frogs – “snakes -” orts) determine the biomass of cereals (t) required for a total increase in the biomass of birds per year of 20 kg. 1 kg of plants accumulates 100 kJ of energy, 1 kg of bird biomass corresponds to 20 kJ.
1) 20 20 = 400 (kJ – energy accumulates 20 kg of bird biomass).
2) 4 million: 100 = 4000 (kJ – cereals should accumulate).
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