An activity was performed in the laboratory "to show the chlorophyll is necessary for photosynthesis". Now answer the following questions:
(a) What kind of leaf has been used in this activity?
(b) How do we destarch a plant?
(c) Why is the leaf heated in alcohol?
(d) What precautions should be taken while heating the alcohol and why?
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Answered by
10
a)destarch
b)by placing it in a dark room for one day
c) so that the colour of leaf should be removed..
d)heat the leaf by giving it slow heat so that the chlorophyll may be removed by producing no great effect..
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b)by placing it in a dark room for one day
c) so that the colour of leaf should be removed..
d)heat the leaf by giving it slow heat so that the chlorophyll may be removed by producing no great effect..
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Answered by
19
(a) variegated leaf
(b) removed the starch present in the leaves by keeping the variegated leaves plant in a dark room or closed cup-board for about 48 hours.
(c) Chlorophyll is a green pigment and so masks the color change of the iodine test for starch. Chlorophyll needs to be removed from the leaf i.e. the leaf needs to be ' decolorized' for changes to be observed. Ethanol is an organic solvent and so extracts chlorophyll from the leaf.
(d) Never heat alcohol directly on a naked flame, you should take a beaker with boiled water in it.
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