This category covers the three key phases of plant growth: differentiation, where cells specialize; dedifferentiation, where specialized cells revert to a less specialized state; and redifferentiation, where cells regain specialization. It includes explanations and practice questions to help understand these biological processes.
Dedifferentiation is the process where mature, specialized cells revert to a meristematic state, regaining the ability to divide.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Growth - Phases Differentiation Dedifferentiation Redifferentiation
Dedifferentiation is the process where mature cells regain their ability to divide and form meristematic tissues.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Growth - Phases Differentiation Dedifferentiation Redifferentiation
Differentiation results in specialized cells with specific functions. Dedifferentiation allows some cells to regain division capacity, but xylem vessels cannot dedifferentiate.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Growth - Phases Differentiation Dedifferentiation Redifferentiation
Plasticity is the ability of a plant to produce different structures from the same meristem depending on environmental or developmental conditions.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Growth - Phases Differentiation Dedifferentiation Redifferentiation
Buttercup exhibits environmental heterophylly, where leaves have different forms when produced in air or water.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Growth - Phases Differentiation Dedifferentiation Redifferentiation
The meristematic phase is characterized by active cell division, large nuclei, and thin primary cell walls.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Growth - Phases Differentiation Dedifferentiation Redifferentiation
The log phase represents exponential growth, characterized by rapid cell division and elongation.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Growth - Phases Differentiation Dedifferentiation Redifferentiation
During the elongation phase, cells increase in size due to water absorption and cell wall loosening. The maturation phase occurs after elongation.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Growth - Phases Differentiation Dedifferentiation Redifferentiation
In the meristematic phase, cells actively divide and have high protoplasm content with large nuclei.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Growth - Phases Differentiation Dedifferentiation Redifferentiation
Intercalary meristems contribute to primary growth by elongating internodes, especially in grasses.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Growth - Phases Differentiation Dedifferentiation Redifferentiation
Dedifferentiation occurs when mature cells regain the ability to divide and become meristematic.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Growth - Phases Differentiation Dedifferentiation Redifferentiation
In the maturation phase, cells attain their maximal size and develop thickened walls to perform specialized functions.
Ref: NCERT Class 11 Biology Chapter 13: Plant Growth and Development Growth - Phases Differentiation Dedifferentiation Redifferentiation
