PLANT PHYSIOLOGY
PLANT MOVEMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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positive phototropism
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negative phototropism
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Either A or B
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None of the above
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Detailed explanation-1: -Reason: Negative phototropism is growth away from light. So roots bend away from the light source and show negative phototropism.
Detailed explanation-2: -In blue or white light, roots exhibit negative phototropism, but red light induces positive phototropism.
Detailed explanation-3: -In the plant stem, responses to light are known as a positive phototropism, which means the stem grows towards the light. In the plant root, responses to light are known as a negative phototropism, which means the root grows away from the light.
Detailed explanation-4: -Wang et al. (2002) also indicated that the root caps of the rice plant perceive the light signal, which results in the negative phototropic response of rice root.
Detailed explanation-5: -Sunlight acts as a stimulus for the growth of organisms towards the light (positive phototropism) or away from light (negative phototropism).