Assertion (A) : The water present in the soil solution passes into  the cell of the root hair by osmosis.

Reason (R) : The concentration of the soil solution is less than that of the cell sap in the root hair.

Water moves from its higher concentration (less conc solution) to its lower concentration (high conc solution). The cell sap in the root hair has more concentration than the soil solution outside. So water moves from soil to root.