In gravitropism, auxin affects the cells in shoots and roots in opposite ways. How are the two effects different?A.In stems, less auxin causes cells to shorten. In roots, more auxin causes cells to shorten.B.In stems, less auxin causes cells to strengthen. In roots, more auxin causes cells to strengthen.C.In stems, more auxin causes cells to grow wider. In roots, less auxin causes cells to grow wider.D.In stems, more auxin causes cells to grow longer. In roots, less auxin causes cells to grow longer.SUBMITarrow_backPREVIOUS
Question
In gravitropism, auxin affects the cells in shoots and roots in opposite ways. How are the two effects different?A.In stems, less auxin causes cells to shorten. In roots, more auxin causes cells to shorten.B.In stems, less auxin causes cells to strengthen. In roots, more auxin causes cells to strengthen.C.In stems, more auxin causes cells to grow wider. In roots, less auxin causes cells to grow wider.D.In stems, more auxin causes cells to grow longer. In roots, less auxin causes cells to grow longer.SUBMITarrow_backPREVIOUS
Solution
The correct answer is D. In stems, more auxin causes cells to grow longer. In roots, less auxin causes cells to grow longer.
Here's why:
Gravitropism is the orientation of a plant or other organism in response to gravity. Auxin is a plant hormone that plays a key role in this process.
In the stem of a plant, auxin promotes cell elongation. When a plant is tilted, auxin is distributed to the lower side of the stem. This higher concentration of auxin promotes the cells on the lower side to grow longer, causing the stem to curve upwards.
In contrast, in the root of a plant, a high concentration of auxin inhibits cell elongation. When a plant is tilted, auxin is distributed to the lower side of the root. This higher concentration of auxin causes the cells on the lower side to grow less, causing the root to curve downwards.
So, in summary, more auxin causes stem cells to grow longer (upwards), while less auxin causes root cells to grow longer (downwards).
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