Teachers are categorized in four main classes in Bangladesh at University level. The ascending rank of teacher is Lecturer, Assistant Professor, Associate Professor and Professor. The initial position Lecturer is generally enrolled as the top student of the class. Master's degree is required for normal university level Lecturer.
Humus soil is soil made up of decayed organic material. Popularly, it refers to soil that is light in texture, dark brown or black in color, and sweet-smelling.
Soil is a mixture of broken rocks and minerals, living organisms, and decaying organic matter called humus. Humus is dark, soft and rich in nutrients. Soil also includes air and water.Organisms in the soil need air and water to survive. Having these essential materials-air, water, and organic matter-makes it possible for plants, bacteria, fungi and small animals like earthworms and insects to live in the soil.umus is dark, soft and rich in nutrients. Soil also includes air and water. Organisms in the soil need air and water to survive. Having these essential materials-air, water, and organic matter-makes it possible for plants, bacteria, fungi and small animals like earthworms and insects to live in the soil.