food production Flashcards
how do polythene tunnels and glasshouses increase crop yields -5
-protect from pests
-control water supply
-artificial light = always photosynthesising
-trap suns heat
-increase co2
how to increase photosynthesis -3
increase temperature
co2 conc
light
how do fertilisers increase crop yield
mineral provided
-nitrogen
-potassium
-phosphates
role of yeast in producing food -4
aerobic resp
produces co2 and ethanol
bread rises from trapped bubbles
yeast killed, alcohol boiled away
which bacteria makes yoghurt
lactobacillus
fermentation
microorganisms break down sugar to make energy
how is yoghurt made
milk pasteurised
lactobacillus added
incubated, fermenter
ferment lactose sugar to form lactic acid
causes milk to clot
what temp is yoghurt incubated to
40
magnesium in fertiliser
chlorophyl
nitrogen in fertiliser
amino acids for preteens for growth
phosphates
atp
