a)
Measure the distance
travelled by spot X.
The distance travelled by spot X is 65
mm.
b)
i.
The solvent front travelled 100mm.
Calculate Rf for spot X where
=
=
0.65
ii.
Identify the pigment in spot X using
the table of Rf values above.
The pigment in spot X is chlorophyll a.
iii.
State one way, apart from Rf
values, which could be used to identify the spot X.
Apart from Rf values, the
spot X can be identified by its colour.
c)
Deduce which of the
photosynthetic pigments listed in the table of Rf values was not
present in Hedera helix.
The photosynthetic pigment that not
present in Hedera helix is
phaeophytin.
Advantage for plants of having more
than one photosynthetic pigment is to cover more of the visible light spectrum
which enables them to capture more light energy.
by Wei kee
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