describe an activity to show that carbon dioxide is essential for photosynthesis
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Aim: To test whether carbon di oxide is needed for photosynthesis
Materials needed: potted plants, bell jars, Petri dish, potassium hydroxide, water, alcohol, iodine, beakers
Method:
1. Take two potted plants and cover them with bell jars.
2. Place a petri dish containing potassium hydroxide in one of the jars. (potassium hydroxide absorbs carbon dioxide.)
3. Place the plants in sunlight for a day.
4. Pluck a leaf from each of them and test the leaves for starch.
The plants in the jar with potassium hydroxide does not get any carbon dioxide. When you perform the iodine test on a leaf from this plant, it will test negative for starch. This proves that photosynthesis did not occur in the absence of carbon dioxide. The leaf in the other plant will test positive for starch.
Materials needed: potted plants, bell jars, Petri dish, potassium hydroxide, water, alcohol, iodine, beakers
Method:
1. Take two potted plants and cover them with bell jars.
2. Place a petri dish containing potassium hydroxide in one of the jars. (potassium hydroxide absorbs carbon dioxide.)
3. Place the plants in sunlight for a day.
4. Pluck a leaf from each of them and test the leaves for starch.
The plants in the jar with potassium hydroxide does not get any carbon dioxide. When you perform the iodine test on a leaf from this plant, it will test negative for starch. This proves that photosynthesis did not occur in the absence of carbon dioxide. The leaf in the other plant will test positive for starch.
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