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ICSE Class 7 Biology Question 5 of 8

Photosynthesis — Question 5

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Question 5

How will you show that chlorophyll is necessary for photosynthesis?

Answer

To show that chlorophyll is necessary for photosynthesis, we will conduct following experiment:

  1. Select a plant with variegated leaves. Chlorophyll is present in the green portion.
  2. Put the plant in sunlight for a few hours.
  3. Pluck any leaf and draw its rough outline indicating the green and non-green portions.
  4. put the leaf in dilute iodine solution.

We observe that the portion of leaf with chlorophyll turns blue-black showing the presence starch. This shows that photosynthesis took places only in the green part of leaf. Thus, chlorophyll is necessary for photosynthesis.