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Answer:(a)Auxin. It is secreted at the Tip of shoot
(b)The higher concentration of auxin on the shady side causes the plant cells on that side to grow more so it bends toward the light.
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HELLO MATE
a)
When growing plants detect light a hormone called auxin , synthesized at the shoot tip helps the cells to grow longer. When light is coming from one side of the plant, auxin diffuses towards the shady side of the shoot.
b)
The bending of plant towards light is known as phototropism. It is due to plant hormone auxins. When the growing parts of a phototropic plant detect sunlight, auxins (synthesized at the shoot tips) help the cells grow longer. When light falls on one side of the plant, the auxins generally diffuse towards the shaded side of the shoot. This stimulates the cells in the shaded area to grow longer than the corresponding cells of the illuminated region. This results in the curvature of the plant stem tip towards the light.
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