Directional example sentences

If 'hydro' means water and 'chemo' refers to chemicals, what would 'hydrotropism' and 'chemotropism' mean? Can we think of examples of these kinds of directional growth movements? One example of chemotropism is the growth of pollen tubes towards ovules, about which we will learn more when we examine the reproductive processes of living organisms.These directional, or tropic, movements can be either towards the stimulus, or away from it.Remember that plants have hormones that control their directional growth.Because this growth is directional, it appears as if the plant is moving.On the other hand, the directional movement of a seedling is caused by growth.In this structure (Figureure 1 3) directional covalent bonds are present throughout the lattice.However, the flow of heat is unidirectional from higher temperature to lower temperature.What functions do animal hormones perform? On the face of it, we cannot imagine their role in directional growth.These and many other spontaneously occurring changes show unidirectional change.