Based on the nature of auxins discussed in the previous section and the explanation of photo-and geotropism, explain how auxins could cause hydrotropism.

Auxins are the phytohormone that helps in cell elongation and division as well

Explanation:

Auxin specifically present on the tips of lateral roots and it facilitates the bending of roots towards various environmental stimuli like hydrotrophism.  Its exact mechanism is the topic of interest for researchers. But it is clear that It works with gene expression that helps in cell elongation and division in response to the stimuli here in case "water" resulting in the larger growth of one part as compared to other parts of root. the most common and well known auxin is Indole acetic acid (IAA)

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.