Which of the following is a biodegradable substance? I. Glass II. Plants III. Plastics IV. Polythene
Option D. Biodegradable items are those, which can be degraded by biological agencies like detrivores. These organisms feed on the dead and decaying matter and convert them into minerals and return those minerals back to the environment, thus completing the cycle of nutrients. Non-biodegradable items are those which cannot be acted upon by detrivores. Thus, such items cannot be degraded or decomposed. In a way, they are a permanent addition to the environment and cannot be done away with. For example, polythene, thermosetting plastics like bakelite, insecticides like DDT, detergent, PVC, etc. These items cannot be degraded biologically.
