Chemotropism is the directional growth of plant parts in response to chemicals. An example is the growth of pollen tubes towards ovules during the reproductive processes of plants.

Hydrotropism is the directional growth of plant parts in response to water. An example is the roots of a plant growing towards a water source in the soil.

Tropic movements in plants refer to directional growth in response to stimuli such as light or gravity. Shoots can exhibit positive phototropism (bending towards light), while roots show negative phototropism (bending away from light). Geotropism is the response to gravity, ...

Cytokinins promote cell division in plants and are present in greater concentrations in areas of rapid cell division, such as in fruits and seeds.

Gibberellins, like auxins, contribute to the growth of the stem. They play a role in promoting stem elongation, similar to auxins, but they may have distinct mechanisms or target areas within the plant.