Structure and Function of Root Hairs

Steps:

• Evaluate statement 1: The cell membrane regulates movement of water and ions into and out of the root hair cell via selective permeability.
• Evaluate statement 2: The vacuole in root hair cells extends into the hair projection, maintaining turgor pressure for absorption.
• Evaluate statement 3: Root hairs form as tubular extensions from epidermal cells in the outer layer of roots, increasing surface area.
• Confirm all statements align with plant biology: root hairs enhance water and mineral uptake.

Why A is correct:

• All three statements match the definition of root hairs as epidermal extensions specialized for absorption, per plant cell structure principles.

Why the others are wrong:

• B omits statement 3, but root hairs are epidermal extensions.
• C omits statement 2, but vacuoles extend into root hairs for osmosis.
• D omits statement 1, but cell membranes control ion and water transport.

Final answer: A