Activity 6.1 | Life processes Class 10 Science | Experiment Chlorophyll required for photosynthesis

Activity 6.1
1) Take a potted plant with variegated leaves - for example, money plant
or crotons.
2) Keep the plant in a dark room for three days so that all the starch
gets used up.
3) Now keep the plant in sunlight for about six hours.
4) Pluck a leaf from the plant. Mark the green areas in it and trace them
on a sheet of paper.
5) Dip the leaf in boiling water for a few minutes.
6) After this, immerse it in a beaker containing alcohol.
7) Carefully place the above beaker in a water-bath and heat till the
alcohol begins to boil.
8) What happens to the colour of the leaf? What is the colour of the
solution?
9) Now dip the leaf in a dilute solution of iodine for a few minutes.
10) Take out the leaf and rinse off the iodine solution.
11) Observe the colour of the leaf and compare this with the tracing of
the leaf done in the beginning (Fig. 6.2).
12) What can you conclude about the presence of starch in various leaves.

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Why we used ethanol? What's the function of it??

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Omg! The tracing is beautiful 😮. And why do we need to break the cell wall?

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Glad it was helpful!

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[@MAZEENJAWAD]

Hello mam I student from Telangana, the same activity

[@robinadi7888]

Why does the leaf need to be variegated ?

[@ChemXpert]

Then only we can prove chlorophyll is required for photosynthesis..because in variegated leaves absence of chlorophyll is at non green leaf part

[@vaylinn2696]

Why there is so much just ?

[@deepahirwar4823]

Why there is need to remove chlorophyll?

[@superbat_019]

To remove the starch stored in them.

[@NeerajSharma-ve1rl]

To

[@pulijalasriya3648]

If chlorophyll is removed,the change in color after testing with iodine will be easy.As blue is not clear when leaf is still green

[@kartikkweera1266]

Chlorophyll is to be removed because chlorophyll interferes in the test of starch due to its green colour..

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