how will you know if a leaf has photosynthesized or not? who will give best answer in 2or 3 lines I will mark him brainliest and don't copy from google or anyware else plz....
Answers
We know that plants performs photosynthesis especially in leaves and other green parts where chlorophyll and stomata are found. The plant use raw materials like Co2 and H2O to convert it into organic substances like Glucose (C6H12O6). The glucose is a simple sugar, and is stored as starch in plants. If we would be able to detect starch in leaves, we can ensure that the leaf is photosynthesized.
Starch is detected by the help of Iodine test.
We have to choose the leaf which we have to experiment with. The leaf is then boiled for sometimes to soften the cells and make the leaf little soft. Now,Take 5 ml of alcohol in a test tube. Put the leaf in the test tube and dip the test tube in the boiling water for few minutes until the alcohol boils.The alcohol will slowly turn green as the chlorophyll in the leaf dissolves in the alcohol. Now, do the same until the entire chlorophyll get dissolved in alcohol. Take the leaf from the test tube and wait for 2 minutes. Now, put 2 drops of iodine solution on the leaf and leave it for 2 minutes.
The leaf should turn a deep blue or blue black, confirming a positive test for starch! This means that the leaf is photosynthesized. And, if not, then the leaf is not photosynthesized.
Diagrammatic steps of Starch Iodine test.
━━━━━━━━━━━━━━━━━━━━
Answer:
By performing an iodine test we can know that the leaf is photosynthesized or not .
Explanation :
When you put iodine on the leaves, one of them will turn blue-black and the other will be a reddish-brown. Iodine is an indicator that turns blue-black in the presence of starch. The leaf that was in the light turns blue-black, which demonstrates that the leaf has been performing photosynthesis and producing starch.