If you grew a plant in a Petri dish and then
turned it on its side, the roots would change
(probably over a day or two) to grow down towards
gravity. Overall, it would look like the roots
had become bent -- the part of the roots near the
stem of the plant would point down towards the
bottom of the petri dish, but because you then
turned it on its side, the part of the roots near
the root tips would be bent pointing down towards
the new direction of gravity, running along the
bottom of the dish.
Yes, the roots may very well grow up against
gravity as long as they are still acquiring
nutrients. The plant, however, should turn and
grow upwards rather than straight out to the side.
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