FORESTRY
PLANT AND WOOD ANATOMY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is the environmental factor most directly involved in phototropism?
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Water
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Soil
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Light
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Nutrients
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Explanation:
Detailed explanation-1: -Auxin distribution controls phototropism. 1. Sunlight strikes the plant from directly above. Auxin (pink dots) encourages growth straight up.
Detailed explanation-2: -As discussed above, phototropic response is exclusively controlled by phots. In Arabidopsis, both phot1 and phot2 control the phototropic responses, albeit differentially.
Detailed explanation-3: -stems toward the light (phototropism) and against the force of gravity (geotropism). The phototropic response occurs because greater quantities of auxin are distributed to the side away from the light than to the side toward it, causing the shaded side to elongate more strongly and thus curve the stem…
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