Question

what does animal dung contain?
(A) phosphorus.
(B) nitrogen.
(C) sulphur.
(D) A and B.

Answer 1

Hint
The animal dung is a type of manure which can be used as rich fertilizers in the agricultural fields. It can be also used as an efficient bio fuel because it contains some natural chemicals that are very much helpful for the fertilizers. These minerals boost the productivity of the crops.

Complete step by step solution
An animal dung is a mixture of faeces and urine which is mainly used as fertilizers in the agricultural fields as it increases the quality of the soil drastically. The animal dung mainly consists of hemicelluloses, cellulose and lignin. The lignin belongs to the class of the organic polymers which is the important material used as the support tissues of the vascular plants, it plays a vital role in the formation of cell walls in a plant. The cellulose is a type of molecule which is made up of countless numbers of oxygens, carbon and hydrogen atoms. It also helps in the formation of cell walls and keeps it rigid. The role of hemicelluloses is to strengthen the cell wall by coordinating with lignin and the cellulose.
The animal dung also consists of twenty-four different types of minerals like cobalt, iron, nitrogen, copper, magnesium and manganese. The mineral nutrients phosphorus and nitrogen are a part of the natural aquatic ecosystem. The mineral nitrogen is very important to the soil because it contributes in the number of leaf growth and nice green colour of the leaf, whereas the mineral phosphorus is important to the soil as the plant uses it for the growth of new roots, to make flowers, fruit and seeds. Therefore, both phosphorus and nitrogen are present in the animal dung.
Hence, the option (D) is the correct answer.

Note
The animal dung is also used as a biofuel, used as raw material for making paper and as an insect repellent. The mineral sulphur is not present in a natural dung, it is present in artificial fertilizers in order to increase the productivity of the crops.