was artificially added to the mutant that it was able to display any hydrotropic response. Equally interesting, the nhr1 mutant shows increased growth rates of roots in response to gravity, and no response to hydrotropic cues. This may be due to the root system being able to freely respond to gravity, without the antagonistic hydrotropic response. The nhr1 plants would begin to show hydrotropic response only in the presence of kinetin, which is a type of cytokinin. This clearly supports the idea that cytokinins play a big role in hydrotropic response. Despite the great support this mutant provides, the genes responsible for these mutants are unknown. The mechanism of hydrotropism can also be explained by plant ‘hearing’. An experimental study discovered that the roots of the plant detect the location of water by sensing the vibrations produced by water movement. The resulting data supports that plants will grow towards these water-produced vibrations. However, it is also seen that plants grow toward other sources of sound in cases where there is no water actually present. These findings also raised the question of how plants distinguish the vibrations produced by water in comparison to other environmental factors, such as insects or wind. When exposed to varying sounds, there were statistically significant results that showed an attractive response (roots grow toward) to water or sounds mimicking water, and an avoidance response (roots grow away from source) (p-value<0.002). In summary, this research showed that pea plants do, in fact, respond to acoustic frequencies. The signal for root growth, in this case, is varying water potential in a plant’s soil environment; the response is differential growth towards higher water potentials. Plants sense water potential gradients in their root cap and bend in the midsection of the root towards that signal. In this way, plants can identify where to go in order to get water. Other stimuli such as gravity, pressure, and vibrations also help plants choreograph root growth towards water acquisition to adapt to varying amounts of water in a plant’s soil environment for use in metabolism. For this reason, it would be beneficial for future research to be conducted on agravitropic mutant plants, such as the ageotropum mutant. Thus, far, these interactions between signals have not been studied in great depth, leaving potential for future research. Recent Research Recent research has found significant involvement of auxin, cytokinin, ABA, and MIZ1 in hydrotropic processes. ABA