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Question
Which one theory is associated with phototropism and geotropism?
Which one theory is associated with phototropism and geotropism?
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Solution
The correct option is B Cholondy-Went theory
According to Cholondy-Went theory, there is more auxin on the lower side of the stems and roots than the upper side. In the stem, the higher concentration of auxin stimulates growth. Therefore, the stem grows more on lower side while roots grow more on the upper side causing stems to bend upwardly and roots to bend downwardly. So Cholondy-Went theory is associated with both phototropism and geotropism.Thus, the correct answer is option D.
According to Cholondy-Went theory, there is more auxin on the lower side of the stems and roots than the upper side. In the stem, the higher concentration of auxin stimulates growth. Therefore, the stem grows more on lower side while roots grow more on the upper side causing stems to bend upwardly and roots to bend downwardly. So Cholondy-Went theory is associated with both phototropism and geotropism.
Thus, the correct answer is option D.
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