Active absorption is governed by ____ theory.

Correct option is C

Correct option: (c) Lecithin theory
Why option (c) is correct:
· Active absorption of ions by plant roots:
· Requires metabolic energy
· Occurs against the concentration gradient
· The Lecithin theory explains active ion absorption by:
· Formation of ion–lecithin complexes
· Transport of ions across the plasma membrane using energy
❌ Why other options are incorrect
· (a) Diffusion
· Explains passive absorption, not active.
· (b) Mass flow
· Movement of nutrients with water flow; passive process.
· (d) Donnan equilibrium
· Explains passive ion distribution, not energy-driven uptake.
�� Key Points
· Active absorption → energy-dependent process
· Governed by Lecithin theory
· Passive absorption → diffusion, mass flow, Donnan equilibrium