GENERAL KNOWLEDGE

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

Detailed explanation-2: -The mixture of rock particles and humus is called the soil. Living organisms, such as bacteria, plant roots and earthworms are also important parts of any soil.

Detailed explanation-3: -Humus increases the minerals of soil that helps plants to grow well and can easily absorb the minerals and water. Humus makes the soil rich in organic compounds that release nitrogen, and phosphorus that helps the other soil habitats to grow well in the soil.

Detailed explanation-4: -The uppermost layer of the soil is called topsoil and this layer contains humus, plant roots, and living creatures.