Show with the help of a labelled diagram that chlorophyll is necessary for phototropism.
Answers
Answer:
The above experiment is given.
Answer:
Explanation:
Step 1: When iodine solution is added, the interior portion of the leaf, which was initially green (containing chlorophyll), becomes blue-black, indicating the presence of starch there. This fact leads us to the conclusion that chlorophyll is necessary for starch production during photosynthesis.
Step 2: In a plant, chlorophyll's function is to absorb light, often sunlight. Two types of energy-storing molecules receive the light energy that is absorbed. The plant utilises its stored energy to turn water and carbon dioxide from the air into glucose, a form of sugar, through photosynthesis.
Step 3: Procedure
Take a plant with variegated leaves which has chlorophyll only in patches. Such leaves can be found in plants like Colews, Tradescantia and Crotom.
Destarch its leaves by placing the plant in dark for 2-3 days.
Place the plant again in day light for about 4-6 hours. Test a leaf for the presence of starch.
Observation
Only the parts which were green previously, turn blue-black with iodine.
Conclusion
This shows that chlorophyl is necessary for photosynthesis.
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