Differentiation and redifferentiation are processes of cellular specialization in plants
1. Differentiation: The process in which unspecialized meristematic cells develop into specialized cells with specific functions.
Example: Cambium differentiating into xylem and phloem.
2. Redifferentiation: The process where previously differentiated cells regain the ability to divide or specialize again for a new function.
Example: Secondary growth in woody plants, where parenchyma cells redifferentiate into vascular tissues.
Identify the labelled parts P, Q, R, and S in the stages of a dicot embryo shown in the diagram.
Choose the option that indicates correct labelling of 'P', 'Q', 'R', and 'S' of embryo in different stages of its development.
Explain the construction of a spherical wavefront by using Huygens' principle.
The slope of the tangent to the curve \( x = \sin\theta \) and \( y = \cos 2\theta \) at \( \theta = \frac{\pi}{6} \) is ___________.