A)
Tube conditions
Intensity of colour (arbitrary units)
Tap water at \[20{}^\circ C\]
10
B)
Tube conditions
Intensity of colour (arbitrary units)
Ethanel at \[20{}^\circ C\]
35
C)
Tube conditions
Intensity of colour (arbitrary units)
Tap water at \[35{}^\circ C\]
35
D)
Tube conditions
Intensity of colour (arbitrary units)
Distilled water at \[45{}^\circ C\]
50
Correct Answer: B
Solution :
Option [b] is correct. Ethanol is a non-polar solvent anel the phospholipid bilayer of the beet root cell membrane is also non-polar. Non-polar solutes dissolve in non-polar solvents and the lipids dissolve in alcohol (ethanol is an organic solvent that can dissolve non-polar and even some polar substance), thus the cell membrane will be disrupted as it. Is dissolved by the ethanol solution. This means that the structure will be altered and there will be more gaps in the phospholipid bilayer, thus the membrane will be more permeable and more of the beet root's red pigment will leak out into the alcohol solvent, causing the solution to become a more intense red colour.
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