How do plants find light. My son has a science projest and needs to know the answer to above question
2007-02-28 05:49:43 · 4 answers · asked by rafferty_dave 1 in Science & Mathematics ➔ Botany
Phototropism is generally described as a plant's response to light. There are two kinds of phototropism: positive photropism, or the growth of a plant stem towards light, and negative phototropism, or the growth of a plant's roots away from light. Phototropic responses are caused by auxins, which modify cell walls within a plant to acheive phototropic effect. Auxins concentrate on the side of a plant stem away from light, in order to stretch rigid plant cell walls into growth toward light. A good way to measure the effect of a phototropism in plants is to measure the length and curvature of a stem before and after phototropic changes.
I would recommend that your son read PLANTS KNOW THE WAY TO GROW. The link is listed below. I think it will give him the message in a way he can understand. You didn't say how old he was. Best of luck.
2007-03-04 03:38:53 · answer #1 · answered by john h 7 · 0⤊ 0⤋
It might also have something to so with starch molecules. The cellulose fibers in plant walls may convert to starch (same molecule, different linkage between glucose units) in the presence of light. The heavier starch molecules pull the plant stem toward the direction of the light.
2007-02-28 07:16:44 · answer #2 · answered by Anonymous · 1⤊ 0⤋
it fairly is have been given to be the the appropriate option spectrum gentle blue for vegetative enhance and you will shop the gentle on for 14 hours an afternoon.for flowering crimson spectrum gentle is optimal yet you may desire to decrease the gentle from blue spectrum 14hrs to 12hrs an afternoon this could carry the plant to flowering degree with any luck.
2016-09-30 00:36:15 · answer #3 · answered by intriago 4 · 0⤊ 0⤋
it is because the side of the plant that receives the light grow slower because of this they automaticly bend towards the light. the shortest side is towards the light
2007-02-28 05:56:08 · answer #4 · answered by gjmb1960 7 · 0⤊ 0⤋