required practical 4 Flashcards
1
Q
independant varriable
A
concentartion of extracts
2
Q
dependant varriable
A
colour of the solution compared to the colour standards
3
Q
control varriable
A
thickness of beetroot
temperature and time in the water bath
4
Q
how to control controlled varriables
A
use cork borer to cut the beetroot
use timer to measure time and thermometer in the water bath
5
Q
how control varriables effect dependant varriables
A
temp being too high would denature beetroot membrane so more pigment would be released
6
Q
error
A
not starting the timer straight away
7
Q
limitations
A
water bath not having a precise temperature
8
Q
improvements
A
use thermostatic water bath
9
Q
what is RP4
A
ethanols effect on cell membrane permeability
