Given below are two statements, one is labelled as Assertion (A) and the other one as Reason (R).
Assertion (A): Mobility is the overall process whereby nutrients reach the root surface and are sorbed into the plant. Reason (R): Mobility involves the solution or exchange of nutrients and movement to root surface.
In light of the above statements, choose the correct answer from the options given below:

Correct option is A

Correct option: (a)
Why (A) is true:
· Nutrient mobility describes how nutrients move through the soil to the root surface and are then sorbed/absorbed by plant roots.
· It encompasses the entire pathway from soil to root uptake.
Why (R) is true and explains (A):
· Mobility indeed includes:
· Nutrients in soil solution,
· Exchange reactions from soil colloids,
· Movement toward the root surface (via mass flow, diffusion, and root interception).
· This directly explains how nutrients reach and are taken up by roots, hence (R) correctly explains (A).
�� Key Points
· Nutrient mobility mechanisms: mass flow, diffusion, root interception.
· Mobility governs availability and uptake efficiency.
· Exchange processes release nutrients from soil colloids into solution for uptake.