Which one of the following pairs is not correctly matched?

Plant tropisms are directional growth movements in response to environmental stimuli. Shoots exhibit positive phototropism as they grow toward light sources [1]. Roots are positively geotropic because they grow downward in the direction of gravity [1]. Chemotropism is observed in pollen tubes, which grow toward chemicals (sugary substances) secreted by the ovule or stigma to facilitate fertilization [1]. Hydrotropism refers to growth in response to water; however, this is a characteristic of roots, which grow toward moisture to absorb water and minerals. Flowers are reproductive structures and do not exhibit hydrotropism as a defining growth movement; instead, they are positioned by the shoot's growth. Therefore, the pair 'Hydrotropic: Flower' is incorrectly matched, as hydrotropism is primarily associated with root systems.

Sources

1. [1] Science , class X (NCERT 2025 ed.) > Chapter 6: Control and Coordination > Activity 6.2 > p. 107