WebAnswer (1 of 2): Good question Most biological reactions are catalysed by enzymes, and these are complex molecules which are damaged by heat. So heating the leaf will generally kill it in the sense of stopping these biological processes. (Poisons that interfere with your enzymes will also kill y... WebA geothermal power plant uses geothermal liquid water at $150^{\circ} \mathrm{C}$ at a rate of 210 kg/s as the heat source, and it produces 5.1 MW of net power in an environment at $25^{\circ} \mathrm{C}.$ If 7.5 MW of exergy entering the plant with the geothermal water is destroyed within the plant, determine (a) the exergy of the geothermal water entering …

NCERT Class 10 Science Lab Manual Light is Necessary

WebOct 1, 2024 · Why is it necessary to boil the leaf in alcohol during the experiment to prove the importance of sunlight in photosynthesis? Answer: Because the hot water kills the leaf and the alcohol breaks down the chlorophyll, taking the green color out of the leaf.When you put iodine on the leaves, one of them will turn blue-black and the other will be a reddish … WebJul 8, 2012 · we do boil leaf in water and alcohol before performing starch test so that the green color (due to chlorophyll) of the leaf is removed. How can you test the presence of … norrahammars sporthall

What will happen if you boil a leaf in alcohol? – Sage-Advices

WebTest for Starch. Apparatus: For this test, students will need a fresh green leaf, approximately 250mL of water, a boiling pot, and a test tube, as well as ethanol and iodine solution. Procedure : Before inserting the leaf in the water, students should boil it for two minutes. Remove the leaf from the jar and place it in a 90 percent ethanol ... WebJan 23, 2024 · Why do we boil the leaf in alcohol when we are testing it for starch? For the starch test, we need to observe the colour change from brown to blue when iodine is put on the leaf. But, initially the leaf is green in colour which does not show the required observation. Hence to remove the green pigment present in the leaf we boil the leaf in ... WebJul 20, 2024 · Why was the leaf boiled in alcohol? We boil the leaf in alcohol when we are checking it for starch to eradicate chlorophyll, which is the green pigment present in leaves. During the starch test, we observe the colour change of leaf from brown to blue when iodine is put on the leaf as iodine reacts with the starch present in the leaf. nor rate