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CBSE - X
Coordination in Plants
Co-ordination in Plants
Tropic movement is a growth movement of a plant part in response to external stimulus.Phototropism is a growth movement of a plant part towards sun light.Geotropism is a growth movement of a plant part towards gravitation.Thigmotropism is a growth movement of a plant part towards touch or contact stimuli.Hydrotropism is a growth movement of a plant part towards water.Chemotropism is a growth movement of a plant part towards chemical.
Nastic responses are non – directional movements of plant parts.Auxins are hormones synthesized in the tip of stem and useful in cell elongation.Giberellins are involved in seed germination, bolting and flowering.Cytokinins are hormones useful in elongation of internodes and organ formation.Abscisic Acid is a hormone to inhibit the growth, closure of stomata.
