required practical 4

Question 1

independant varriable

Answer 1

concentartion of extracts

Question 2

dependant varriable

Answer 2

colour of the solution compared to the colour standards

Question 3

control varriable

Answer 3

thickness of beetroot
temperature and time in the water bath

Question 4

how to control controlled varriables

Answer 4

use cork borer to cut the beetroot
use timer to measure time and thermometer in the water bath

Question 5

how control varriables effect dependant varriables

Answer 5

temp being too high would denature beetroot membrane so more pigment would be released

Question 6

error

Answer 6

not starting the timer straight away

Question 7

limitations

Answer 7

water bath not having a precise temperature

Question 8

improvements

Answer 8

use thermostatic water bath

Question 9

what is RP4

Answer 9

ethanols effect on cell membrane permeability