(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, \( AP = 1 \, \text{cm}, \ BP = 2 \, \text{cm}, \ AQ = 1.5 \, \text{cm}, \ AC = 4.5 \, \text{cm} \) Prove that \( \triangle APQ \sim \triangle ABC \).
Hence, find the length of \( PQ \), if \( BC = 3.6 \, \text{cm} \).