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Cotton plants typically possess a tap root system, which is characterized by a primary root that grows downward and deeper into the soil, allowing the plant to access moisture and nutrients located at greater depths. This type of root system provides strong anchorage and support for the plant, particularly in varying soil conditions. In addition, the deeper tap roots can help cotton plants survive periods of drought by reaching moisture that shallower root systems cannot access.

Other root systems mentioned, such as fibrous roots, involve a network of roots that spread out horizontally near the soil surface, which is not typical for cotton. Rhizomes are modified subterranean stems that can produce new shoots and roots, leading to vegetative reproduction, while crown roots emerge from the base of the plant but do not define the primary type of root system for cotton. Therefore, understanding the significance of the tap root system helps clarify why it is the correct answer for the root structure commonly associated with cotton plants.