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Movement : is one kind of responses of an organism to stimulus the stimulus can come from outside (external) or from the inside (Internal) of the organism.
Irritability : the ability to respond the stimulus.
1. Tropism : is the movement of a part of a plant organ in response to stimulus,the direction can be toward or away from the stimulus.
2. Taxis : the movement of plant body towards or away from stimulus
3. Nastic : the movement direction is not determined by the source of stimulus , this movement occurs due to the difference of turgor pressure.
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