Abscisic acid (ABA), phenolic acid and para-ascorbic acid are inhibitory substances that cause seed dormancy.
Effect of inhibitory substance can be removed by application of certain chemicals like gibberellic acid and nitrates.
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: