Question

Activity
Aim: To demonstrate the occurrence of
photosynthesis in a healthy leaf
(To be demonstrated by the teacher)
Things required: A green leaf, alcohol, burner,
test tube, beaker, forceps, water, and iodine
solution
4. Using forceps, carefully take the leaf out and
wash it in water. Put a few drops of iodine
solution on the leaf.
Observation: You will see the leaf turning blue-
black in colour.
Explanation: When iodine is added to starch, its
colour changes to blue-black. Thus, change in colour
of the leaf to blue-black on adding a few drops of
iodine solution indicates the presence of starch.
Method:
1.
2.
10
Take a potted plant and keep it under the
sun for a few hours.
Take a leaf from this plant and put it in the
test tube containing alcohol. Now put the
test tube in the beaker containing water,
using forceps.
Keep the complete setup over the burner
and let it boil till all the chlorophyll is
removed from the leaf, that is, the green
colour of the leaf disappears.
[Caution: Do not heat the test tube
containing alcohol directly on the burner as
alcohol is inflammable.]
M
3.
Conclusion: The presence of starch confirms that
the process of photosynthesis had taken place in
the leaf.change in direct​

Answer 1

Answer:

13gfjttffghfdyigttrt