What is the significance of (w.e.f. 3-1-1977) in this context?
The phrase "(w.e.f. 3-1-1977)" stands for "With effect from 3rd January, 1977". It indicates that the changes mentioned in the context (Ins. by s. 8 and s. 9) were made on or after this date, referring to a specific amendment or update to the existing rules or laws.