(a) Wheat: The recommended seed rate is 100-125 kg per hectare under normal conditions, depending on the variety and planting method.
(b) Mustard: The recommended seed rate is 4-5 kg per hectare, as mustard requires lower seed density for proper spacing.
These seed rates ensure optimal plant population and maximum yield.
In the adjoining figure, TP and TQ are tangents drawn to a circle with centre O. If $\angle OPQ = 15^\circ$ and $\angle PTQ = \theta$, then find the value of $\sin 2\theta$. 