Question

observation of the leaves in the glass What did it tell us​

Answer 1

Answer:

He will find that the leaf which was inside the glass bottle having no carbon dioxide around it, does not turn blue on adding iodine solution showing that no starch is present in this leaf. From this observation, we conclude that the photosynthesis to make starch in the leaf does not take place without carbon dioxide.

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Answer 2

Answer:

This observation leads us to the conclusion that carbon dioxide is necessary for photosynthesis in order for the leaf to produce starch.

Explanation:

• [This process is known as cellular or plant respiration.] Your leaves that were exposed to the sun should have numerous tiny bubbles, if you look closely.
• These are oxygen atoms that are escaping and creating bubbles because they are submerged.

• One of the leaves will turn blue-black and the other will turn reddish-brown when you apply iodine to them.
• Iodine is an indication that changes colour from blue to black when starch is present.
• The leaf that was in the light changes from green to blue-black, showing that it has been doing photosynthesis and making starch.

• The exposed areas will turn blue-black with iodine solution after the starch test, whereas the area covered by the black paper strip will turn brown.

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