Question

please give CBSE class10 biology activity 15.5 materials required, observation, and inference​

Answer 1

Answer:

ExpAim: 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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