Question

root hair ...... the surface area ​

Answer 1

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Answer 2

Root hair cells are specialized epidermal cells that greatly increase the surface area of roots. As such, they are widely believed to play an important role in plant nutrition by facilitating the absorption of water and nutrients. This is a reasonable working hypothesis but one, like all hypotheses, that needs to be tested and refined. Indeed, this proposed function of root hairs raises a host of questions. For example, are the rates of absorption of all nutrients raised in parallel by the increase in root surface area resulting from the presence of root hairs? Do root hairs function in processes other than absorption (e.g. in anchorage)? If root hairs are such a valuable adaptation for absorption, why doesn't every root epidermal cell differentiate into a root hair cell, and why do some plants, such as many conifers, live quite comfortably without them? This month's The Hot and the Classic examines the role of root hair mutants, especially those of Arabidopsis, in addressing fundamental questions concerning root hair function.