Final answer:
The gravitational force does relate to the growth direction of a seedling's stem and roots, a response known as gravitropism. Stems display negative gravitropism by growing upward, while roots exhibit positive gravitropism by growing downward.
Step-by-step explanation:
The direction of the gravitational force acting on a seedling is indeed related to the direction in which the stem and roots grow. This phenomenon is known as gravitropism, which is the growth of plant organs in response to the pull of gravity. Roots exhibit positive gravitropism, growing downward, while the stems show negative gravitropism, growing upward. If a plant is placed on its side, the stem and new leaves will curve upward due to this response. Gravitropism ensures that the shoots grow away from gravity to reach sunlight and that roots grow toward gravity to anchor the plant and absorb water and nutrients from the soil.
Therefore, the assertion that the direction of the gravitational force influences the growth of a seedling's stem and roots is True.