A hygroscopic movement is

Downward growth of roots

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Growth of aerial shoot towards light

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Movement of the leaflets of Mimosa

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Movement of elaters

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Solution

The correct option is D Movement of elaters
Hygroscopic movement is that, which is caused by changes in moisture content of unevenly thickened cell walls. E.g., elators or the awns of the grains of some grasses. Also hygrometric movement, imbibitional movement.

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