CBSE Class 9 Biology Chapter 3 (Tissues) By Homi Institute

1. CBSE Class 9 Biology
Tissues

2. 4.

3. Orientation of sections for the study of wood anatomy.
(A) Transverse; (B) longitudinal; (C) *Tangential.

4. Differentiation: The process which leads to maturation of cells is called differentiation. During
differentiation, a few or major changes happen in protoplasm and cell walls of the cells.
Dedifferentiation: A differentiated cell can regain its capacity for cell division under certain conditions. This
phenomenon is called dedifferentiation.
Redifferentiation: A dedifferentiated plant cell once again loses its capacity to divide and becomes mature.
This phenomenon is called redifferentiation.