Dear student.
Biodegradable waste includes any organic matter in waste which can be broken down into carbon dioxide, water, methane or simple organic molecules by micro-organisms and other living things using composting, aerobic digestion, anaerobic digestion or similar processes. So, Farmers can use cow dunk as a organic fertilizer which is a biodegradable waste product also the organic waste like vegetable peels, and other organic waste can be dumped to form compost over days which is biodegradable waste used by the farmers.
Regards