Bending of stem towards light is known as:

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(B) The bending of a plant stem towards a light source is a type of growth movement called phototropism. Since the question specifically refers to the

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Heliotropism

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(B) The bending of a plant stem towards a light source is a type of growth movement called phototropism. Since the question specifically refers to the movement towards the sun or light,it is also commonly referred to as heliotropism. Photoperiodism refers to the response of plants to the relative lengths of day and night. Photonasty is a non-directional movement in response to light. Hydrotropism is the growth movement of plant parts in response to water.

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