A student placed a potted plant growing in a glass pot horizontally (with the root and shoot, both being in the horizontal direction). After a few days, the student observed that the root of the plant bends downwards and the shoot (stem) of the plant bends upwards. Which scientific term is used to indicate:
(a) upward bending of shoot (or stem)?
(b) downward bending of root?

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Solution

(a) upward bending of shoot (or stem) - phototropism
(b) downward bending of root - geotropism

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(a) upward bending of shoot (or stem) - phototropism (b) downward bending of root - geotropism

(a) upward bending of shoot (or stem) - phototropism
(b) downward bending of root - geotropism