Stimuli - Changes in surrounding., Tropism - response of plants to stimuli, positive tropism - growing response towards stimuli, negative tropism - growing response away from stimuli, phototropism tve - occur for photosynthesis, phototropism - by shoot, geotropism - stimuli by gravity, hydrotropism tve - stimuli by water, root - positive hydrotropism, hydrotropism - roots downward, anhydrous CaCl - Absorb water vapour, Thigmotropism - response towards touch, tendrils - twine stems, twining stem - to support the plants, nastic movement - response towards touch with drastic movement,

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