food production

Question 1

how do polythene tunnels and glasshouses increase crop yields -5

Answer 1

-protect from pests
-control water supply
-artificial light = always photosynthesising
-trap suns heat
-increase co2

Question 2

how to increase photosynthesis -3

Answer 2

increase temperature
co2 conc
light

Question 3

how do fertilisers increase crop yield

Answer 3

mineral provided
-nitrogen
-potassium
-phosphorus

Question 4

role of yeast in producing food -4

Answer 4

aerobic resp
produces co2 and ethanol
bread rises from trapped bubbles
yeast killed, alcohol boiled away

Question 5

which bacteria makes yoghurt

Answer 5

lactobacillus

Question 6

fermentation

Answer 6

microorganisms break down sugar to make energy

Question 7

how is yoghurt made

Answer 7

milk pasteurised
lactobacillus added
incubated, fermenter
ferment lactose sugar to form lactic acid
causes milk to clot

Question 8

what temp is yoghurt incubated to

Answer 8

40

Question 9

magnesium in fertiliser

Answer 9

chlorophyl

Question 10

nitrogen in fertiliser

Answer 10

amino acids for preteens for growth

Question 11

phosphates

Answer 11

atp