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Show how co2 is necessary for …

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Show how co2 is necessary for plants ??
  • 1 answers

Yogita Ingle 4 years, 4 months ago

Aim: To show that carbon dioxide is necessary for photosynthesis

 Procedure:

  • Take a plant with destarched leaves.
  • Insert one of its leaves in a conical flask containing potassium hydroxide.
  • Leave the plant in sunlight.
  • After a few hours, test the particular leaf and some other leaf of the same plant for the presence of starch.

Observation:

 The leaf which was inserted in the conical flask stains brown, and the other leaf which is exposed to sunlight turns blue-black.

Inference:

Potassium hydroxide in the flask absorbs carbon dioxide; thus, due to the absence of CO2, the leaf fails to produce starch which proves that carbon dioxide is necessary for photosynthesis.

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