Bean seeds were planted and put on a sunny wi | vedclass

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(A) The plant hormone,$Auxin$,is distributed more on the side away from the unilateral illumination,causing cells to grow faster in the darker side. T

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unequal distribution of auxin in the stem.

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(A) The plant hormone,$Auxin$,is distributed more on the side away from the unilateral illumination,causing cells to grow faster in the darker side. This differential growth causes the plant to bend toward the light,a phenomenon known as phototropism. If the distribution were equal,the plant would grow straight upwards. Neurotransmitters are chemicals secreted by multicellular animals and are used in transmitting impulses in the nervous system,not in plant growth responses.

Bean seeds were planted and put on a sunny windowsill. As the plants grew,their stems bent toward the window. This bending was most likely caused by an

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