## CORE INFORMATION\n✓ **Answer**: D\n## CONCEPT FRAMEWORK\n\t**Primary Concept**: Root Hair Characteristics\n\t**Related Topics**: Plant Cells, Root Anatomy, Cell Life Span\n\t**Prerequisites**: Basic knowledge of plant structures and cell biology.\n## SOLUTION PATHWAY\n**Given Information**:\n\t* Question asks for the characteristics of root hairs.\n**Method & Steps**:\n\t1.\tRecall the defining features of root hairs.\n\t\tReasoning: Root hairs are specialized epidermal cells of plant roots.\n\t2.\tIdentify the correct option based on the recalled knowledge.\n\t\tWorking: Root hairs are known to be single-celled (unicellular) and have a short lifespan.\n\t3.\tSelect the option that matches the features.\n\t\tResult: Option D matches the characteristics of root hairs.\n ## OPTION ANALYSIS\n[A] :x: Endogenous refers to origin within the plant, not a characteristic of the cell itself.\n[B] :x: Root hairs are not multicellular; they are a single cell.\n[C] :x: Root cap protects the root tip, not the root hairs.\n[D] ✓: Root hairs are unicellular extensions and they are short lived.\n ## LEARNING AIDS\n\t**Common Mistakes**:\n\t\t1.[Error 1]: Confusing root hairs with root structure in general: [Focus on root hairs being single cells and not a tissue or organ]\n\t\t2.[Error 2]: Misremembering the term 'endogenous': [Endogenous relates to the origin, not the physical attributes of the cell.]\n\t**Quick Tips**:\n\t\t1.[Helpful shortcut]: Visualize root hairs as tiny, individual extensions from the root surface.\n\t\t2.[Memory aid]: Associate 'uni' with 'one' to remember that root hairs are unicellular.

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