write a note on geotropism
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Gravitropism (also known as geotropism) is a coordinated process of differential growth by a plant or fungus in response to gravity pulling on it. It is a general feature of all higher and many lower plants as well as other organisms. Charles Darwin was one of the first to scientifically document that rootsshow positive gravitropism and stems show negative gravitropism.[1] That is, roots grow in the direction of gravitational pull (i.e., downward) and stems grow in the opposite direction (i.e., upwards). This behavior can be easily demonstrated with any potted plant. When laid onto its side, the growing parts of the stem begin to display negative gravitropism, growing (biologists say, turning; see tropism) upwards. Hebaverns (non-woody) stems are capable of a small degree of actual bending, but most of the redirected movement occurs as a consequence of root or stem growth outside.
Geotropism is the upward and downward movement of plant's shoot and root respectively due to gravitational pull is called geotropism.
Postive geotropism:- The roots of a plant exhibit positive geotropism because it grows towards the pull of gravity.
Negative geotropism:- The stem of a plant exhibit negative geotropism because it grows in the direction opposite to the pull of gravity.