Chapter 15- Our Environment

NCERT SOLUTIONS Chapter 15. Our Environment QUESTIONS Page No. 257 1. Why are some substances biodegradable and non-biodegradable ? Ans: Biodegradable Substances: Some substances which are degraded and broken down into simpler substances by microorganisms are called biodegradable substances . Example: Cotton, wood , paper etc. Non-biodegradable Substances: Some substances Read more…