Option 1: Epidermis and Stele
The cortex is the region of the plant that is located between the epidermis (outer layer) and the stele (inner vascular region). The cortex mainly consists of parenchyma cells and plays a role in storage and transport of materials.
The other options are incorrect because:
The cortex is located between the epidermis and stele, which makes Option 1 the correct answer.
A sphere of radius R is cut from a larger solid sphere of radius 2R as shown in the figure. The ratio of the moment of inertia of the smaller sphere to that of the rest part of the sphere about the Y-axis is : 
AB is a part of an electrical circuit (see figure). The potential difference \(V_A - V_B\), at the instant when current \(i = 2\) A and is increasing at a rate of 1 amp/second is: