A large part of the Ganga-Brahmaputra delta is associated with which vegetation region?

Correct answer: Sundarbans mangroves

The correct answer is Sundarbans mangroves. The Ganga-Brahmaputra delta is a low-lying tidal region where freshwater from rivers mixes with saline water from the Bay of Bengal. Mangrove plants are specially adapted to this environment through salt tolerance, tangled supporting roots and, in many species, breathing roots that help them survive waterlogged mud. The Sundarbans is the best-known mangrove region of this delta. Alpine forests require high mountainous conditions, desert vegetation requires very dry conditions, and thorn scrub is associated with semi-arid areas. Thus the delta’s tidal, saline setting clearly points to option D.