BIOLOGY
HORMONES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The concentration of auxin in the plant increases when there is light.
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Auxin causes uniform growth on every stem.
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Auxin causes cells that are on the dark side to grow faster.
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Auxin causes the increase in the number of plant cells.
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Detailed explanation-1: -Auxin is the first discovered plant hormone . It is produced at the stem tip and promotes cell elongation. When light falls auxin moves to the darker side of the plant (Shaded region). It causes the cells in that region to grow larger than the cells corresponding to the lighter side of the plant.
Detailed explanation-2: -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-3: -It grows because the auxin causes the cells to elongate on the shaded side, so this side grows more. This unequal growth of the two sides, results in the growth of the stem towards the light. If lit from above, the plant will grow upwards. Auxins have the opposite effect on root cells.
Detailed explanation-4: -Auxin is a key regulator of plant growth and development, orchestrating cell division, elongation and differentiation, embryonic development, root and stem tropisms, apical dominance, and transition to flowering.
Detailed explanation-5: -Auxin promotes cell elongation due to weakening of the cell wall combined with influx of water (which literally stretches the cells). Because the cell expansion occurs only on the shaded side of the stem, the plant bends away from the shade and toward the light.