Question

the growth of a plant in the direction of its light source is called ______.
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Explanation:

In biology (a subfield of Natural Science), the growth of a plant in response to light, specifically towards the light source, is a well - known phenomenon. This phenomenon is called phototropism. Phototropism is a type of tropism, which is a directional growth response of a plant to an external stimulus (in this case, light).

Answer:

phototropism