OBJECTIVE FORESTRY

Detailed explanation-1: -Final answer: A forest is a purifier of air and water.

Detailed explanation-2: -In nature, water is filtered through layers of soil, sand, rock, and other natural materials like leaves. Surfaces where water can penetrate are called permeable surfaces. Impervious surfaces, like rooftops and paved roadways, are surfaces where water cannot penetrate.

Detailed explanation-3: -The world’s forests absorb a third of global emissions every year. Particles, odors and pollutant gases such as nitrogen oxides, ammonia and sulfur dioxide settle on the leaves of a tree. Trees absorb these toxic chemicals through their stomata, or ‘pores’, effectively filtering these chemicals from the air.

Detailed explanation-4: -In the absence of trees, the soil is washed away or eroded; this is because roots of trees normally bind the soil together. Thus, a forest is a purifier of air and water.