food production

Question 1

experiment to demonstrate the evolution of CO2 from living organisms

Answer 1

pea seeds in water: highest temp change
pea soaked in disinfectant: middle
boiled peas : least

Question 2

yeast cell

Answer 2

bud at the top
nucleus
vacuole
cell wall 
cell membrane
mitochondria

Question 3

rate of ethanol effect on rate of respiration

Answer 3

ethanol is a toxic waste product produced in anaerobic respiration, as conc increases the rate of enzyme activity and respiration declines eventually yeast cells die.

Question 4

glucose conc

Answer 4

increases until saturation

Question 5

yeast experiment

Answer 5

add 25 g of flour to a beaker and then add 1g of sugar
place 30 cm^3 of yeast suspension into a 50cm3 measuring cylinder stir until a smooth paste
put in a measuring cylinder, record volume in a suuitable table
place cylinder in baths and record volume increase. do for diff temps

Question 6

parts of a fertiliser

Answer 6

motor: stirring paddles
stirring paddles: to mix the contents, keeps micro-organisms in suspension so they are always in contact with nutrients
water: cold water pumped thorugh to maintain optimum temp.

Question 7

yoghurt making process