PHOTO means light. PHOTOTROPISM is a process in which the plants react or grows towards the source of light. This is positive phototropism and if plant move away from light then it is negative phototropism.
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Phototropism is the response of plant organs to the direction of light.

Two Types of Phototropism are Positive phototropism and Negative phototropism.

If growth of the plant is toward the light is called Positive phototropism.

If growth of the plant is away from the sunlight is called Negative phototropism.

Plant shoots display Positive phototropism and plant roots display Negative phototropism.