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Thread: Photosynthesis

  1. #1 Photosynthesis 
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    Hi, I'm thinking about something here; let's say we have a plant, and cover half a leaf with aluminium foil, denying it light energy. What happens?

    The photo synthesis requires light to work, and now that it doesn't get any, the cells in the leaf will have to use up their supply of starch to cover for the loss of sugar, right? So if we would use some kind of an indicator (like iodine) and put that on the leaf, then we should have a leaf that is half blue and half green. Am I correct or off the wall?


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  3. #2 Re: Photosynthesis 
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    Quote Originally Posted by acidosis
    Hi, I'm thinking about something here; let's say we have a plant, and cover half a leaf with aluminium foil, denying it light energy. What happens?

    The photo synthesis requires light to work, and now that it doesn't get any, the cells in the leaf will have to use up their supply of starch to cover for the loss of sugar, right? So if we would use some kind of an indicator (like iodine) and put that on the leaf, then we should have a leaf that is half blue and half green. Am I correct or off the wall?
    You're pretty on the nail, I think. Without light, the elave would decolorate... then the next woudl depend upon the plant and how much surface of leave was afected; if the leave was too damage,d it would dry and fall, or maybe would be infected... but a sturdy plant, and not sheeting the whole leave, probably the leave would be bi-color, until light hit it and the colorant was moved. What I can't figure is, would the leave turn green again if light hit it after whiting out...? Guess there's a simple experiment here, lol!


    “If the misery of the poor be caused not by the laws of nature, but by our institutions, great is our sin.” -Charles Darwin
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  4. #3  
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    I did this in school with a typical leaf from a herbaceous dicot garden-plant. The part covered with the foil eventually turned brown and died but the other part remains healthy. Indeed, there would be no starch in the brown part and there would be starch in the healthy bit.


    If the foil was removed I don't think that the leaf would recover. Eventually, I think that the whole leaf would die due to the spreading attack of a fungus or else it would just die naturally.
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