PLANT PHYSIOLOGY
PLANT MOVEMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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plant grow towards stimulus
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plant grow away from the stimulus
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plant adapt towards environments changes
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None of the above
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Detailed explanation-1: -One important light response in plants is phototropism, which involves growth toward-or away from-a light source. Positive phototropism is growth towards a light source; negative phototropism is growth away from light.
Detailed explanation-2: -Tropisms can have a sign: positive if the plant grows toward or in the direction of the stimulus or negative if it moves away from the stimulus.
Detailed explanation-3: -A tropism is directional growth in response to a stimulus. A positive tropism occurs when a plant (or a part of the plant) grows towards the stimulus, and a negative tropism is growth away from the stimulus. Phototropism is directional growth in response to light (Figure 14.1.
Detailed explanation-4: -Phototropism is the movement of plant parts in response to light. Thus, the stimulus for phototropism is “Light”.
Detailed explanation-5: -A tropism is plant movement in response to an external stimulus in the environment. If a plant moves towards a stimulus, then it exhibits positive tropism; if a plant moves away from a stimulus, then it exhibits negative tropism.