Final answer:
When a plant is placed horizontally, the roots will grow downwards and the shoots will grow upwards in response to gravity.
Step-by-step explanation:
When a plant is placed horizontally, it will respond to gravity by showing a phenomenon called gravitropism. The roots of the plant will grow downwards, towards the ground, which is known as positive gravitropism. The shoots of the plant will grow upwards, against gravity, which is known as negative gravitropism.
For example, strawberry plants have horizontal stems called stolons that run over the ground surface. If these stolons take root, they will form new plants. This is an adaptation of the plant to spread and reproduce.