Farming practices and productivityAQA A-Level Biology: Mind map

Exam questions on Farming practices and productivity

1. A farmer rears broiler chickens for meat. The chickens are kept in warm, closed sheds at a constant temperature, with little space to move around.
   Explain how the farmer's practices increase the net production of the chickens.2 marks
2. A farmer grows wheat. She sprays the crop with a herbicide to kill weeds, an insecticide to kill aphids and a fungicide to kill fungal pathogens.
   Explain how the fungicide increases the yield of the wheat.2 marks
3. Two farmers rear beef cattle. Farmer A lets the cattle roam freely over a large pasture. Farmer B keeps the cattle in a barn at a constant 18 °C with little room to move. Each animal ingests food with a chemical energy store of 240 MJ per week. The animals on farm A store 24 MJ per week in new biomass, and those on farm B store 48 MJ per week.
   Calculate the percentage of ingested energy that is stored in new biomass on each farm, and state how many times greater it is on farm B than on farm A.3 marks