Question

how do you prove that co2 is essential for photosynthesis

Answer 1

Answer:

EXPERIMENT TO PROVE THE NECESSITY OF CARBON DIOXIDE IN PHOTOSYNTHESIS

Aim-

To prove the necessity of carbon dioxide in photosynthesis following steps need to do

Insert a part of the leaf of a destarched 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.

Answer 2

Final Answer:

It can be proved that carbon-di-oxide is essential for photosynthesis with a simple experiment involving iodine and potassium hydroxide.

Explanation:

Note the following points.

• Potassium hydroxide solution is represented as $KOH$.
• Carbon-di-oxide is represented as $CO_2$.
• Potassium hydroxide solution can absorb carbon-di-oxide.
• Starch reacts with iodine to form a blue-black color, which can be used to identify the presence of starch.

Step 1 of 5

The experiment starts with taking two healthy plants potted in separate pots. Keep both plants in darkness for a few days till all the carbon-di-oxide fixed in both plants is get used up by the plants.

Step 2 of 5

Keep the two plants under two separate closed air-tight bell jar containers. In one of these jars, place an open small container having the $KOH$ solution beside one plant. Keep both jars in full sunlight for a few hours.

Step 3 of 5

Now, pluck a few leaves from both plants, and mark them properly to identify them properly. Next, boil the leaves separately in ethanol to remove chlorophyll completely from them. Apply iodine solution over the two leaves.

Step 4 of 5

The observations of the experiment are as follows.

• The leaves of the plant from the jar without the $KOH$ solution turn a blue-black color.
• But the leaves of the plant from the jar with the $KOH$ solution do not change color.

Step 5 of 5

The inference drawn from the experiment is as follows.

• $KOH$ solution absorbed the carbon-di-oxide. So the jar containing the $KOH$ solution is devoid of carbon dioxide.
• Therefore, the leaves of the plant from the jar with the $KOH$ solution do not change color with iodine, because in the absence of carbon-di-oxide, the plant cannot produce starch.
• The leaves of the plant present in the jar without the $KOH$ solution turn a blue-black color because the starch in the leaves reacts with iodine.

Therefore, it is proved that carbon-di-oxide is essential for photosynthesis with a simple experiment involving iodine and potassium hydroxide.

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