Question

why is holding up of leaves of sensitive plant on touching with finger is not the tropism

Answer 1

When the Mimosa pudica, commonly known as the sensitive plant, is touched by another organism, its leaves fold in upon themselves and its stems droop. It is hypothesized that this rapid folding deters herbivores and insects from eating the plant by making the plant appear smaller, while simultaneously exposing the sharp spines on the plant stems. The Mimosa also exhibits this movement during the night and when it is exposed to abiotic factors such as excessive heat and rain, protecting the plant from physical damage or desiccation.
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Answer 2

tropism is a growth movement example
phototropism, chemotropism etc they all are accompanied by plant growth but folding of leaves of sensitive plant on touching is the result of osmosis (increase or decrease in water concentration) in leaves it is not called as tropism but called Thigmonastism..
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