7. Chlorophyll and carbon dioxide are necessary conditions for plants to photosynthesise. How can you prove this? Explain each with the help of a diagram.
Answers
Answer:
photosynthesis is the process by which green plants and some other organisms use sunlight nutrition,carbon dioxide use to give out oxygen, chlorophyll to collect sunlight to make food
Answer:
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EXPERIMENT :
To prove the necessity of carbon dioxide in photosynthesis following steps need to doInsert a part of the leaf of a destarched plant into a conical flask containing potassium hydroxide.
- plant into a conical flask containing potassium hydroxide.Potassium hydroxide solution absorbs the carbon dioxide gas from the air present in the glass bottle.Leave the plant sunlight.
- After few hours, perform a starch test to this and another leaf of the same plant.
OBSERVATION :
- Leaf exposed to the atmosphere are bluish black.
- Leaf exposed to KOH does not change to blue-black colour.
RESULT :
Starch is present in the green part of the leaf.
CONCLUSION :
Presence of starch proves that chlorophyll is necessary for photosynthesis as it traps sunlight.
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Chlorophyll makes it possible for plants to convert carbon dioxide and water, in the presence of sunlight, into oxygen and glucose. During this process of photosynthesis, chlorophyll produces energy, in the form of sugary carbohydrates, which will power all of the plant's essential growth and development.
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Explanation:
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