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Water enters root hairs by osmosis because the soil solution is ___ compared with the cell sap:

  • A more dilute
  • B more concentrated
  • C exactly identical
  • D entirely gaseous

Correct answer: A. more dilute

Explanation: The dilute (hypotonic) soil solution has a higher water potential, so water moves into the root cells.

Concept context

Water and mineral absorption, the ascent of sap, transpiration, and phloem transport via the pressure flow hypothesis.

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