Phototropism close phototropismGrowth of plant shoots towards the light. is a response to the stimulus of light. In the plant stem, responses to light are known as a positive phototropism ...

3. Stem elongation: The direction and intensity of light influence stem elongation. In a phenomenon known as phototropism, plants grow towards a light source. The hormone auxin is responsible for this ...

Just like phototropism, gravitropism is also caused by an unequal distribution of auxin. When a stem is placed horizontally, the bottom side contains more auxin and grows more - causing the stem ...