OBJECTIVE FORESTRY

Detailed explanation-1: -Weathering of rocks produces small particles of various materials. These include sand and clay. The relative amount of sand and clay depends upon the rock from which the particles were formed, that is the parent rock . The mixture of rock particles and humus is called the soil.

Detailed explanation-2: -It is made up mainly of mineral particles, organic materials, air, water and living organisms-all of which interact slowly yet constantly. Most plants get their nutrients from the soil and they are the main source of food for humans, animals and birds.

Detailed explanation-3: -Loam: The mixture of sand, silt, and clay is called loam. It is able to maintain moisture and nutrients, and thus, it is more appropriate for farming. The soil is also referred to as agricultural soil because it contains a mixture of the soil content of all three kinds of sandy, clay, and silt.

Detailed explanation-4: -Soil is made up of: Organic particles of decayed plant and animal materials which come from living plant and animal bodies; Mineral particles such as sand, clay, stones or gravel which were once parts of larger rocks.

Detailed explanation-5: -Soil consists of minerals, humus, water, air and living organisms. Soil particles: Based on their sizes, the soil particles can be divided into four major groups viz., Clay, Silt, Sand and Gravel.