How does auxin control the direction of root growth so that roots grow down into the ground, rather than up out of the ground?

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    Auxin stimulates a negative gravitropism.
    Roots respond to light penetrating the soil in a manner known as positive phototropism.
    Auxin accumulates along the side of the growing root furthest from the ground surface. This inhibits cell elongation on the lower side of the root, and the root bends and grows downward.
    all of the above

asked May 30, 2013 in Biology by anonymous
    

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Auxin accumulates along the side of the growing root furthest from the ground surface. This inhibits cell elongation on the lower side of the root, and the root bends and grows downward.
answered May 31, 2013 by Bioshare ~Top Expert~ (34,070 points)

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