There are multiple ways to classify biomass into different categories; compare some of these and mention pros and cons of such approaches.

Answer: The three approaches to classifying biomass are based on the source of biomass, the composition of biomass, and the energy content of biomass. 1. Source of biomass: Pros: Helps in understanding the availability and distribution of biomass resources and identifying the most suitable biomass resources for specific applications. Cons: Doesn't take into account specific characteristics such as energy content, moisture content, or composition, and may have difficulties in uniform classification. 2. Composition of biomass: Pros: Provides information about the potential use of biomass and allows for targeted research and development for improving biomass conversion technologies. Cons: Can be more complex due to varying proportions and the compositional analysis may require expensive and time-consuming techniques. 3. Energy content of biomass: Pros: Helps in estimating the potential energy generation and efficiency of biomass conversion and assists in choosing suitable biomass resources for specific energy-related applications. Cons: Measurement may be impacted by factors such as moisture content and impurities, and doesn't give detailed information about specific properties or composition of the biomass for certain applications.