PLANTS
PLANT RESPONSES TO STIMULI
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Decreased water pressure within the plant cells.
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lack of nutrients carried by water in the plant.
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Decreased rate of photosynthesis in the stem.
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Increased storage of glucose in the leaves.
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Detailed explanation-1: -When a plant wilts due to a drought, it is responding to which of the following internal stimuli? Decreased water pressure within the plant cells.
Detailed explanation-2: -On a hot, dry day (or after several days with no rain or watering), transpiration causes more water to be lost than is coming in, and the water balance within the plant can get thrown off. The dehydrated collapsing cells in the leaves and stems can no longer remain erect, and the plant begins to wilt.
Detailed explanation-3: -As with responses to external stimuli, plants rely on hormones to send signals within the plant in order to respond to internal stimuli. For example, some hormones signal a plant to expand its root system in response to lack of water or nutrients.
Detailed explanation-4: -Plant roots always grow downward because specialized cells in root caps detect and respond to gravity. This is an example of a tropism. A tropism is a turning toward or away from a stimulus in the environment. Growing toward gravity is called geotropism.
Detailed explanation-5: -Plants also have internal stimuli that can cause the organism to respond. For example, if a plant is lacking water inside of its cells, wilting will occur as a response.