Answer:
you are asked to write your laboratory report right?
Explanation:
we need to see the laboratory experiment to answer this question. But according to my search, the answer may be the following:
Stems in these plants exhibit positive phototropism and grow in the direction of a light source. Photoreceptors in plant cells detect light, and plant hormones, such as auxins, are directed to the side of the stem that is furthermost from the light.