BIOLOGY
HORMONES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It is caused by an electrical signal.
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One chemical involved is ethylene.
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Auxin causes a growth increase on one side of the stem.
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Auxin causes a decrease in growth on the side of the stem exposed to light.
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Detailed explanation-1: -Plants growing in a partially dark environment will grow toward light in a response called phototropism. Which of the following statements is true regarding phototropism? It is caused by an electrical signal.
Detailed explanation-2: -Phototropisms. In a stem, the shaded side contains more auxin and grows longer, which causes the stem to grow towards the light. The plant does NOT bend towards the light. It grows because the auxin causes the cells to elongate on the shaded side, so this side grows more.
Detailed explanation-3: -Auxin promotes cell elongation, causing the plant to grow more on the shady side and bend in the direction of the light source.
Detailed explanation-4: -Phototropism, or the differential cell elongation exhibited by a plant organ in response to directional blue light, provides the plant with a means to optimize photosynthetic light capture in the aerial portion and water and nutrient acquisition in the roots.
Detailed explanation-5: -Phototropism is the ability of the plant to re-orient the shoot growth towards a direction of light source. Phototropism is important to plants as it enhances the ability of plants to optimize their photosynthetic capacity. As discussed above, phototropic response is exclusively controlled by phots.