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Dear Student
Ans. Option b) is correct: Unidirectional effect of environmental factors on plant parts.
Tropic movement is the response to stimuli that comes from one direction. It is a directional movement. f the movement of the plant part is towards the stimulus, then it is known as positive tropism. If the movement of the plant part is away from the stimulus, then it is known as negative tropism. For example phototropism, chemotropism, geotropism, hydrotropism etc.
Regards
Ans. Option b) is correct: Unidirectional effect of environmental factors on plant parts.
Tropic movement is the response to stimuli that comes from one direction. It is a directional movement. f the movement of the plant part is towards the stimulus, then it is known as positive tropism. If the movement of the plant part is away from the stimulus, then it is known as negative tropism. For example phototropism, chemotropism, geotropism, hydrotropism etc.
Regards