Question

Describe an experiment to show that the carbon dioxide is essential for the process of the photosynthesis. (10 marks) it is a 1o marks question and hence, the answer should be worth 10 marks.

Answer 1

Answer:

Materrials required : destarched plant, wide mouthed bottle,splitcork, potassium hydroxide solution........

Procedure: take a wide mouthed transparent bottle. pour potassium hydroxide solution in the bottle. insert splitted cork in the mouth of the bottle. insert one of the leaf of destarched plant into a transparent bottle containing potassium hydroxide solution. after few hours, test the insert leaf and another leaf of the same plant for presence of starch......

Observation: we observe that the part exposed to the sun light and atmospheric air became bluish- bkack and the one side bottle containing potassium hydroxide which absorbs carbon dioxide in the bottle remained colourless........

Conclusion : by this activity we can conclude that the leaves which exposed to sunlight used sunlight and carbon dioxide but the leaf which is inside used sunlight but not used carbon dioxide.... so co2 is necessary for photosynthesis..........

hopes it helps you mark it as brainliest..........

Answer 2

Answer:

Aim:

To show that carbon dioxide is essential for photosynthesis.

Materials required:

• A potted plant,  
• a cork,
• potassium hydroxide solution,
• wide mouthed bottle,

Procedure:

1. Take a potted plant with elongated leaves which have been destarched by keeping the plant in dark for three to four days.
2. Take an empty bottle and put a little amount of potassium hydroxide (KOH) in it.
3. Now cut the cork of the bottle into two parts and place it on one of the leaves of the potted plant in between the two parts of the cork.
4. Now put the bottle in the presence of sunlight for about 72 – 96 hours.
5. Now test the leaf for the presence of starch.

Observation:

You will observe that the part of the leave exposed to the sun light and atmospheric air became bluish- black and the one inside the bottle containing potassium hydroxide which absorbs carbon dioxide in the bottle remained colourless.

Conclusion:

From the above activity, we can conclude that carbon dioxide is essential for photosynthesis

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