Question

Write an activity to proof that green plants of leaf can photosynthesise .​

Answer 1

Answer:

Take a potted plant with variegated leaves like croton and keep it a dark region, away from sunlight for 3 days. ... Immerse the leaf in boiling alcohol to decolourize it. Leaf slowly loses its green color, which goes into the alcohol

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Answer 2

Proof :-

• Take a potted plant with variegated leaves like croton and keep it a dark region, away from sunlight for 3 days. This will halt photosynthesis and destarch 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 decolourize it. Leaf slowly loses its green color, which goes into the alcohol.
• Dip this decolorized leaf in iodine solution. Now remove the leaf from iodine solution and rinse it in distilled water. Remove the leaf from distilled water and keep it on a petri dish.
• Two color regions are visible in the leaf. They are reddish brown and blue-black

Conclusion :-

• we can conclude 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.

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