जैव-अनिम्नीकरणीय (non-biodegradable) पदार्थ का उदाहरण है:

उत्तर: (B) पॉलिथीन की थैली — Non-biodegradable substances cannot be broken down by microorganisms. Examples: plastics, polythene, glass, metals, synthetic fibers. Biodegradable: paper, food waste, cotton, wood.