Generally, biomass is used for all materials originating from photosynthesis. In other
words, biomass includes all plant growth, herbaceous plants, microalgae, macroalgae
and aquatic plants. But biomass can equally apply to animal as well. In fact, biomass is
carbon based and is composed of a mixture of organic molecules containing hydrogen,
usually including atoms of oxygen, often nitrogen and also small quantities of other
atoms, including alkali, alkaline earth and heavy metals.