Question

In mall half leaf experiment the part of the leaf inside the flask to not become blue black after adding iodine drops it is because
A ) starch formation does not take place in that part
B ) CO2 was absent inside the flask
C ) entering into the flask do not have more intensity
D ) both A and B

Answer 1

Both A and B

Explanation:

co2 was absent in the flask so starch also not formed

Answer 2

Option D. both A and B are correct.

• Mohl's half leaf experiment is performed to demonstrate the necessity of carbon dioxide for the process of photosynthesis to form starch.
• In this experiment, half part of one leaf is inserted into a bottle that is corked and contains KOH solution then the plant is placed in sunlight for a few hours.
• KOH or Potassium Hydroxide is used because it can absorb CO₂ and the presence of iodine turns the leaf into blue-black in the presence of starch but in absence of starch, it turns brown.
• The plant is placed in the dark to remove starch from the plant which is needed to start the experiment.
• This experiment is used to prove the use of carbon dioxide in the process of photosynthesis. Light and carbon dioxide are essential components of the process of photosynthesis.

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