(i) Bulbs in parallel provide more illumination. This is because(a) each bulb gets same voltage and is equal to the applied voltage.(b) each bulb draws required current from the mains. Hence, they work properly.(ii)When one bulb in each circuit get fused, In series: Rest of the bulbs will not glow. This is because in series arrangement, there is only a single path for the flow of current. In parallel: Rest of the bulbs will continue to glow as in parallel connection,(a) individual branch in the circuit completes its own circuit, or(b) different paths are available for the flow of current.(iii) Circuit diagram