Sentence Examples


  • These occur on the tips of tendrils and on the tentacles of Drosera; (2) sensitive papillae found on the irritable filaments of certain stamens; and (3) sensitive hairs or bristles on the leaves of Dionaea muscipula and Mimosa pudicaall of which are so constructed that any pressure exerted on them at once reacts on the protoplasm.
  • There is every reason to believe that plants are as irritable to varying external conditions as they are to light or to gravity.
  • In other words, the plant must be irritable to the stimulus exerted from without, and be capable of responding to it by changes of form and structure.
  • It is assumed, as an inevitable conclusion from the facts of evolution, that plant-protoplasm possesses (I) an inherent tendency towards higher organization, and (2) that it is irritable to external conditions, or to changes in them, and can respond to them by changes of form which may be either indefinite or definite (adaptive).
  • Though occasionally irritable in speech, in his written polemics he was remarkable for courtesy to opponents and a capacity to understand their point of view.

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