Plz ans my doubt

Dear Student,                                                                                                                                    
Ans. Option a) is correct: IAA   

IAA stands for indole-3 acetic acid. 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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