CBSE Class 7 Answered
1. Write an activity to show carbondioxide is necessary for photosynthesis?
Asked by Nimmi | 04 May, 2018, 12:13: PM
Expert Answer
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.
Answered by Sheetal Kolte | 04 May, 2018, 04:15: PM
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Nutrition in Plants
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