What does it mean when gladiolus and snapdragon stems are categorized as geotropic?

The term "geotropic" refers to how a plant responds to gravity. When gladiolus and snapdragon stems are categorized as geotropic, it means they exhibit a growth response in relation to the gravitational pull. Specifically, the tips of these stems will bend away from the ground or gravity, allowing the plant to grow upright. This response is critical for the plant's overall structure, ensuring that the leaves and flowers are oriented toward light sources, which is essential for photosynthesis.

In contrast, other characteristics mentioned in the options highlight different plant behaviors, such as phototropism—growth toward light—rather than geotropism. The straight line growth or blooming behavior during the night does not relate to gravity but instead to other environmental stimuli or plant characteristics. Therefore, the understanding of geotropism is crucial for interpreting how these plants grow and develop in their environments.