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Thread: School Experiment Help

  1. #1 School Experiment Help 
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    Hi all, sorry if this is the wrong section.

    I am doing a simple experiment (at home) for a school assessment (agriculture). It has to be related to plant growth and the light source. I wanted to do "Do plants grow towards the light source?" The thing is, I need to include some measurable data and I'm not sure what I would include that relates to the question. I can only think of the angle of plant growth maybe? I was thinking about the height etc. but it doesn't really relate to the question.

    I think I might just do something more simple (eg. how is a plant affected by having no light, some light etc).

    If you have any ideas of 'measurable data' that would relate to the topic please let me know. or if you have any better ideas to test instead. thanks!


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  3. #2  
    Forum Ph.D.
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    Ok this is what I would do; get a bunch of paper cups, potting soil, and a place to grow seedlings like a big table in a warm room. Put one seed, in soil, in each cup. Keeping moisture, temperature and all other variabls constant, vary the amount of light the cups are exposed to. After six weeks carefully measure the grownth in each cup. Compare the gorwth to a control group of cups which were exposed to natural day light.
    Clear?


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  4. #3  
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    Anybody who has grown plants from seed has seen that the seedlings will grow toward the light source, but if you wanted to quantify it, it wouldn't be that hard to do. Grow some with the grow lights directly overhead, and some others with the light coming in at an angle from the side. You can measure the angle of the seedling's growth by measuring the vertical height and the horizontal distance of the top of the plant from the point where it sprouted out of the soil. Compare that to the angle the light is coming in from. Try some different plant varieties and compare them.
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  5. #4  
    Forum Radioactive Isotope sculptor's Avatar
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    read up on heliotropism
    you'll get to read about hundreds of other similar experiments

    ....................
    on a personal note
    the lighting in my greenhouse is over the paths, not the plants, that way, the leaves face the humans-----------much more pleasing on the eye...
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  6. #5  
    Universal Mind John Galt's Avatar
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    Quote Originally Posted by sculptor View Post
    the lighting in my greenhouse is over the paths, not the plants, that way, the leaves face the humans-----------much more pleasing on the eye...
    So, they are staring at you........all the time......just watching.........and waiting. Growing....imperceptibly....and watching.
    sculptor likes this.
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  7. #6  
    Forum Radioactive Isotope sculptor's Avatar
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    real creepy guys
    .................
    happy all hallows eve
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