Describe the process that that causes the water to enter the root hair cell

{Osmosis}

Osmosis is the spontaneous net movement of solvent molecules through a semi-permeable membrane into a region of higher solute concentration, in the direction that tends to equalize the solute concentrations on the two sides.

Oxygen enters root hair cells through the tubes that extend

The correct answer is - epiphyseal plate.

Explanation:

Achondroplastic dwarfism is genetic disorder that occurs Due to the failing in elongation of the long bones of the limbs. This failing of the elongation takes place due to the reduced hyperplasia and hypertrophy of cartilage in the epiphyseal plate, that present at the end of long bones and produce the bone.

The epiphyseal plate is the site of growth of the bones for longitudinal growth by the hypertrophy, and proliferation of cell. Change or error in the gene cause the reduce hypertrophy and proliferation of the cell of cartilage in the epiphyseal plate that leads to the Achondroplastic dwarfism.

Thus, the correct answer is - epiphyseal plate.