OBJECTIVE FORESTRY

Detailed explanation-1: -In addition to the plant material in leaf litter, humus is composed of decaying animals, such as insects, and other organisms, such as mushrooms. Humus is dark, organic material that forms in soil when plant and animal matter decays. When plants drop leaves, twigs, and other material to the ground, it piles up.

Detailed explanation-2: -It is a kind of soil organic matter. It is rich in nutrients and retains moisture in the soil. Humus is the Latin word for “earth” or “ground".

Detailed explanation-3: -Humus or humified organic matter is the remaining part of organic matter that has been used and transformed by many different soil organisms. It is a relatively stable component formed by humic substances, including humic acids, fulvic acids, hymatomelanic acids and humins (Tan, 1994).

Detailed explanation-4: -Clayey soil is very fertile and has a high amount of humus in it as humus can easily mix with clay. Thus the correct option is (C) Clayey soil.

Detailed explanation-5: -humus, nonliving, finely divided organic matter in soil, derived from microbial decomposition of plant and animal substances. Humus, which ranges in colour from brown to black, consists of about 60 percent carbon, 6 percent nitrogen, and smaller amounts of phosphorus and sulfur.