Question

Formation of manures from leaves is a physical process:
A. True
B. False

Answer 1

Hint: Manure is an organic matter that is used as organic fertilizer in agriculture. Most manure includes animal feces; other sources of manures are composts and green manure. Manure contributes to the fertility of the soil by adding organic matter and nutrients such as nitrogen.

Complete step by step answer:
Green manure are the crops grown for the express purpose of plowing them in, thus increasing fertility through the incorporation of the nutrients and organic matter into the soil. Leguminous plants are basically used for such purposes as they fix nitrogen using rhizobia bacteria.
Some other types of plant matter used as manures are contents of rumens of slaughters, spent grains, and seaweeds.
So, the formation of manures from leaves is considered a chemical change because the manure formed has a different composition of leaves. Many reactions occur to convert leaves into manures, most of them are irreversible.
Manure is formed because of the decomposition of the leaves, which is only possible by any changes in the chemical nature of the leaves.
Manure is an organic matter used as a fertilizer in agriculture. It is prepared using green leaves and hence the process cannot be reversed. Hence, it is a chemical process.

So, the correct answer is “Option B- FALSE”.

Note:
Manures which are prepared using leaves are known as compost. Compost is organic matter that has been decomposed in the process of decomposition.
The process recycles various organic matter. Compost is rich in nutrients.
The compost itself is used in land in many ways, it is used as soil conditioner, fertilizers, additions of vitals humus or humic acid and as natural pesticides for the soil.