Answer :

Take a potted plant with variegated leaves like croton and keep it in a dark region, away from sunlight for 3 days. This will halt photosynthesis and de-starch the plant. Then keep the plant facing the sunlight for 6 to 8 hours. The plant can now carry out photosynthesis and produce starch.

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Experiment :-

  • Take a potted plant with variegated leaves like croton and keep it in a dark region, away from sunlight for 3 days. This will halt photosynthesis and de-starch the plant.

  • Then keep the plant facing the sunlight for 6 to 8 hours.

  • The plant can now carry out photosynthesis and produce starch.

  • Mark the green areas in the leaf and trace them on a sheet of paper. Mark the regions as green and yellow.

  • The green areas contain chlorophyll which is absent in the yellow areas.

  • Immerse the leaf in boiling alcohol to decolorize it. The leaf slowly loses its green color, which goes into the alcohol.

  • Dip this decolorized leaf in iodine solution. Now remove the leaf from the iodine solution and rinse it in distilled water.

  • Remove the leaf from distilled water and keep it on a petri dish.

Observation :-

  • Two-color regions are visible in the leaf.

  • They are reddish-brown and blue-black.

Conclusion :-

  • It can be concluded that the earlier green parts of the leaf turn blue-black whereas the yellow parts have become reddish-brown.

  • Green parts of the leaf possess chlorophyll; hence they carry out photosynthesis and produce starch, which turns blue-black with iodine.

Hope it helps :)

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