PLANTS
PLANT RESPONSES TO STIMULI
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It shows positive geotropism
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It shows positive hydrotropism
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It shows positive phototropism
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None of the given answer
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Detailed explanation-1: -Shoots tend to exhibit positive phototropism by growing toward it while roots show negative phototropism by growing away from it. Some vine tips can show negative phototropism. Hence, phototropism can be both positive and negative.
Detailed explanation-2: -Phototropisms. In a stem, the shaded side contains more auxin and grows longer, which causes the stem to grow towards the light.
Detailed explanation-3: -Hormones in the plant’s tissues, called auxins, make cells on the dark side of the plant grow taller, bending the plant toward the light.
Detailed explanation-4: -Positive phototropism is growth towards a light source; negative phototropism is growth away from light. Shoots, or above-ground parts of plants, generally display positive phototropism-they bend toward the light.