HORTICULTURE

Detailed explanation-1: -Humus is dark, organic material that forms in soil when plant and animal matter decays.

Detailed explanation-2: -The uppermost layer of the soil is called topsoil and this layer contains humus, plant roots, and living creatures. The more humus found in topsoil, the more nutrient rich the topsoil and the better the conditions for growing plants.

Detailed explanation-3: -"Rich in humus” means the material contains some organic matter, but maybe a lot of inert filler too. Completely finished compost made from mixed yard waste is virtually 100% humus. Mulch: Anything placed on the surface of the soil to retain moisture and prevent weeds.

Detailed explanation-4: -Answer: Solution: The micro-organisms which convert the dead plants and animals to humus are known as decomposers. Examples: Fungi and Bacteria. Decomposers recycle and convert the dead matter into humus which mixes with forest soil and provides necessary nutrients to plants.