part of
lyICONI, Iodine solution.
Fure :
e a potted plant and cover a part of one of its leaves with aluminium foil.
ce the plant in sunlight
Aluminium foil
ck the leaf after a few days and remove the aluminium foil from it.
e about 20 mL of ethyl alcohol in a boiling tube and dip the leaf in it.
e the boiling tube in a hot water bath.
A
r sometime, when the alcohol turns green, remove the leaf from the
the leaf is
covered with
79 tube.
aluminium foil means
the leaf with warm water. Place a few drops of iodine solution on
elld ni
eaf. What do you observe ?
Hold Go
Ethyl
lodine
alcohol
solution No blue-black colour
ion of the leaf exposed to sunlight
Water
Blue-black
-blue-black. The portion which was
(starch
the aluminium foil does not show
with iodine
solution gives
colour.
blue or blue
ns : From this experiment we
black colour)
Green chlorophyll The portion of the leaf exposed to sunlight
make starch as food by
dissolves in ethyl becomes blue-black, whereas that covered with
alcohol aluminium foil does not show any colour change.
ynthesis.
An experiment to show that sunlight is essential
+ is necessary for photosynthesis.
tion : please seen this picture brainly and meaning again repeat solution
Answers
Answer:
Take a potted plant with variegated leaves for example, money plant or crotons.
Keep the plant in a dark room for three days so that all the starch gets used up.
Now keep the plant in sunlight for about six hours.
Pluck a leaf from the plant. Mark the green areas in it and trace them on a sheet of paper.
Dip the leaf in boiling water for a few minutes.
After this, immerse it in a beaker containing alcohol.
Carefully place the above beaker in a water bath and heat till the alcohol begins to boil.
Question 1. What happens to the colour of the leaf? What is the colour of the solution?
Now dip the leaf in a dilute solution of iodine for a few minutes.
Take out the leaf and rinse off the iodine solution.
Observe the colour of the leaf and compare this with the tracing of the leaf done in the beginning.
Question 2. What can you conclude about the presence of starch in various areas of the leaf?
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Answer
The hot water kills the leaf and the alcohol breaks down the chlorophyll, taking the green color out of the leaf. When you put iodine on the leaves, one of them will turn blue-black and the other will be a reddish-brown. Iodine is an indicator that turns blue-black in the presence of starch. The leaf that was in the light turns blue-black, which demonstrates that the leaf has been performing photosynthesis and producing starch.
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