Question

Which of the following is not a biomass energy source?
a. Wood
b. Cow dung
c. Sugarcane
d. Coal

Answer 1

Hint: Biomass energy source is the source of energy that is derived from the organic source, from organic materials that are renewable sources of energy.

Complete step by step answer:
What do you mean by biomass or what do you think about which materials come under biomass? So Biomass can be considered as the plant materials or the animal material that is used for production of heat or electricity. In simple words we can say that biomass is used in the production of energy and this is the reason that the biomass is considered as the source of energy.
The organic materials that are renewable in nature are considered to be the part of the biomass and further these materials are used in making energy. Some plant-derived biomass releases after being burned yet they are considered as the renewable materials and also the part of the biomass source of energy. Do you all know why?
These plant materials after being burnt and releasing carbon dioxide gas, Carbon dioxide gas gets back into plants or comes back into the plant during the process of photosynthesis and again they become a part of the plant and we know carbon dioxide plays a very vital role in plants.
In the question we have four materials. Let's talk about them. First option is Wood since wood is a renewable and constantly increasing material it is a part of the biomass. Second Option is Cow dung which is also an organic material and hence the part of biomass.
Third option is Sugarcane is also a renewable material and fast growing resource yet considered as biomass. Fourth option is coal which is a renewable rock but takes a millions of years to get renewed. Since Coal is a fossil fuel hence is not considered as the biomass source of energy.
So, the correct option is d.

Note: Always remember that the coal is organic sedimentary rock and rocks are not organic because they are composed of minerals. Hence other options are not correct. And we obtain biomass sources of energy from organic sources and not from non-organic sources.