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  4. Phototropic curvature is the result of uneven distribution of

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Q. Phototropic curvature is the result of uneven distribution of

AIPMTAIPMT 2010Plant Growth and Development

Solution:

Phototropic curvature is the result of uneven distribution of auxin. Charles Darwin and his son Francis Darwin observed that the coleoptiles of canary grass responded to unilateral illmination by growing towards the light source (phototropism). After a series of experiments, it was concluded that the tip of coleoptile contain auxin that caused the bending of the entire coleoptile in relation to the direction of light.