Q.Write a short note on: a. Differentiation

Differentiation is the process by which cells derived from meristematic tissue mature and become structurally and functionally specialized (e.g., into xylem, phloem, or other permanent tissues); redifferentiation is w...

Differentiation makes a cell specialized; redifferentiation lets an already-specialized cell become dividing/meristematic again.

Differentiation refers to the developmental changes that a relatively unspecialized cell derived from meristematic (apical, lateral or intercalary) tissue undergoes to acquire specific structural features and physiological functions suited to a permanent tissue — for example, a meristematic cell may differentiate into a xylem vessel element (developing lignified secondary walls and losing its protoplast) or into a phloem sieve tube element. Redifferentiation describes the reverse-then-forward process: cells that have already differentiated and matured can, under appropriate conditions (such as wounding, or in secondary growth from cork cambium/vascular cambium), dedifferentiate back to a meristematic, actively dividing state, and then redifferentiate into new specialized cells to perform a fresh function — for example, parenchyma cells becoming meristematic to form a cork cambium that later produces cork cells, or cells forming a wound-healing callus that later differentiate into new tissue.