Question

Write the precautions to be taken in the experiment CO2 is essential for photosynthesis

Answer 1

1)use healthy potted plant..
2)KOH must be freshly prepared
3)glass container must be tightly sealed using vaseline....
Hope this helps. ...Please mark as brainliest. .......

Answer 2

The precautions to be taken in the experiment CO₂ is essential for photosynthesis are:

• A healthy potted plant should be used.

• The experiment setup should be airtight to avoid entering carbon dioxide inside it.

• The leaves should be heated in a water bath to prevent the alcohol from catching fire.
• Distilled water should be used.

Photosynthesis is a process in which green plants prepare their own food by absorbing carbon dioxide from the air in the presence of sunlight and green pigment chlorophyll.

The following methods should be followed to verify CO₂ is required for photosynthesis:

1. Take a potted plant having healthy leaves in sunlight for 2 or 3 days to make it starch-free.
2. Put some KOH in a bottle and place one leaf inside the bottle fitted with the cork to make it airtight.
3. Place the potted plant in sunlight for 2 to 3 hours.
4. Cut the leaf kept inside the bottle and another free leaf of the plant.
5. Put each leaf in a separate test tube with alcohol inside it.
6. The test tubes are then kept in a water bath and heated gently for a few minutes.
7. The leaf kept inside the bottle changes to pale yellow color due to the absence of starch while the other becomes blue-black in color.

The presence of blue-black color of the leaf shows the presence of starch in the leaf and proves that CO₂ is essential for photosynthesis.