Regulatory functions of forest are:

The regulatory functions of a forest are maintenance of the gaseous balance, moderation of climate and regulation of the hydrological cycle.

Statement 1, production of fuel wood, is a productive or provisioning function, not a regulatory one.

Statement 2, maintenance of gaseous balance, is regulatory as forests balance oxygen and carbon dioxide.

Statement 3, prevention from pollution, is treated as a protective rather than a regulatory function here.

Statement 4, moderation of climate, is regulatory since forests temper temperature and rainfall.

Statement 5, regulation of the hydrological cycle, is regulatory as forests govern water flow and recharge.

Forests also give supporting services such as soil formation and nutrient cycling.