AP BIOLOGY

Detailed explanation-1: -They cannot be absorbed by diffusion, because the minerals are in very low concentration. Instead, active transport is used. The root hair cells have carrier proteins in their cell membranes. These pick up the mineral ions and move them across the membrane into the cell against the concentration gradient .

Detailed explanation-2: -Root hair cells Plants absorb water from the soil by osmosis. They absorb mineral ions by active transport, against the concentration gradient. Root hair cells are adapted for taking up water and mineral ions by having a large surface area to increase the rate of absorption.

Detailed explanation-3: -Mostly the movement of mineral ions into root occurs due to diffusion.

Detailed explanation-4: -By Active transportation the molecules moves against a concentration gradient. So, the active transport is the technique that moves mineral ions into root hair cells through membrane proteins in the process of assimilation.