Consider the following pairs regarding weather systems and their roles in driving rainfall during the north-east monsoon season over Peninsular India:

Pairs

1. Trough — An elongated region of relatively low atmospheric pressure that channels moisture and promotes cloud formation between two circulation systems
2. Cyclonic circulation — A rotational wind pattern around a low-pressure centre that can intensify into a low-pressure area or depression over warm ocean surfaces
3. Wind convergence zone — A region where opposing or meeting airflows converge, forcing air upward and triggering convection and rainfall