AP BIOLOGY

Detailed explanation-1: -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-2: -Mineral ions must be transported against a concentration gradient. Active transport ensures that the required mineral ions are absorbed from the dilute solutions within the soil into the root hair cells. This process requires energy.

Detailed explanation-3: -Active transport is the process that helps to move the molecules against a concentration gradient. So, the active transport is the process that moves mineral ions into root hair cells through membrane proteins.

Detailed explanation-4: -Mineral ions are in a higher concentration inside the root hair cells than in the soil. They then move via active transport from the soil into the root hair cells in order to enter the plant. This can explain why active transport is necessary in root hair cells.