Question

Decomposition of vegetable matter into compost is an example of ………….
(i) Exothermic reaction
(ii) Endothermic reaction
(iii) Anaerobic decomposition
(iv) Aerobic decomposition
A) (i), (II)
B) (i), (iii), (iv)
C) (i) ,(iv)
D) (ii), (iii), (iv)

Answer 1

Hint: The answer here is based on the basic concept of chemistry which includes the fact that decomposition can be brought up by the natural process by microbes and also by bond breaking process.

Complete answer:
From the lower classes of biochemistry, we have studied about the decomposition reaction of natural matters into compost.
Now, let us study about the vegetable matter we use and its process of decomposition.
- Vegetable matter is the remnants of used vegetables and the outer skin of vegetables which are decomposed by several methods.
-The decomposition of these matters when dumped in a soil is usually carried out by the microbes present in the soil.
- This process of decomposition involves breaking of the bonds present in the vegetables and thus this process of bond breaking is an endothermic process.
- Also the process of the decomposition of organic matter by microbes is also a major biological process which takes place in the presence of gaseous oxygen and thus this process is also called aerobic decomposition.
- Anaerobic process is the one in which gaseous oxygen is prevented from entering the sealed tanks. In the vegetable matter decomposition, several microbes are even able to decompose without the gaseous oxygen that is deep under mud which is called fermentation. Therefore, composting involves both aerobic and anaerobic decomposition.

Therefore, the correct answer is option (D).

Note: The shortcut answer to this question includes the fact that usually decomposition of organic matter is carried out by microbes and this is both aerobic and anaerobic which involves endothermic processes.