SSC
BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following are involved in phototrophism? I. auxinII. proton pumpsIII. expansinsIV. sunlight
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I and II only
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I, II and III only
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II and III only
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I, II, III and IV
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Explanation:
Detailed explanation-1: -auxin distributions are responsible for phototropic responses-i.e., the growth of plant parts such as shoot tips and leaves toward light. In certain cases auxin may be destroyed on the illuminated side, and the unilluminated side with more auxin elongates, causing the shoot to bend toward the light.
Detailed explanation-2: -Examples: Curving of the stem toward sunlight (Positive phototropism) Movement of root away from the light inside the soil (Negative phototropism)
There is 1 question to complete.