Question

If the root hair cell is surrounded by a dilute solution of mineral ions. The mineral ions will move

• A. Against the concentration gradient by diffusion or osmosis.
• B. Against the concentration gradient by active transport.
• C. Along the concentration gradient by diffusion or osmosis.
• D. Along the concentration gradient by active transport.

Answer 1

Answer: (B)

Against the concentration gradient by active transport.

Active transport is the transport where the ions or solute are transported against the concentration gradient. It requires ATP which pushes the ions against the gradient through the membrane transporters or ion channels. When the roots are dipped in the dilute solution of the mineral ions the ions are actively transported from the dilute mineral solution inside the roots which has high concentration of mineral ions. The root cells have enormous mitochondria which mainly produces energy for respiration. Thus, the correct answer is option B.