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The apparatus is widely used to illustrate phototropism is known as

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Arc auxanometer

Clinostat

Heliotropic chamber

Photometer

answer is C.

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Detailed Solution

Concept: Seedlings kept in heliotropic chambers bend their stems towards the light source, whereas seedlings kept open in a container under direct sunshine grow straight.

The stem is favorably phototrophic, with bending toward unidirectional light, according to the study.

Because there is more auxin in that particular location, there is more bending.

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