Discuss rac's answer to: Trees grow upwards on a slope - Why ?

I noticed that trees that grow on a slope still grow straight upwards (not vertical to the ground). How do trees "know" to grow straight upwards ?

rac
rac Answered:

It is called "geotropism", which casues a plant to grow general "straight" up  -- the same characteristic causes roots to grow generally down.  The attraction of plants to light, which causes a plant to grow toward light is called "phototropism"

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Brittany
Brittany Thinks this answer is Helpful:

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