AP BIOLOGY

Detailed explanation-1: -when a root grows in the direction of the force of gravity, this is known as a positive geotropism.

Detailed explanation-2: -If the movement of the plant parts is towards the pull of gravity, it is known as positive geotropism; whereas if the movement of the plant parts is in the direction opposite to the pull of gravity, it is known as negative geotropism. The movement of roots towards the soil is an example of positive geotropism.

Detailed explanation-3: -Roots show positive geotropism and grow towards the force of gravity. Again, this ensures that roots bury themselves deeper within the soil, so they can anchor the plant and absorb more water for photosynthesis.

Detailed explanation-4: -Positive geotropism is the movement of plant parts in the direction of the gravitational attraction, whereas negative geotropism is the movement of plant parts in the direction of the gravitational pull. Since they develop in opposition to gravity’s pull downward, geotropism also helps plant shoots stand upright.