Defining Biodegradable Substances

Substances that can be easily degraded, or broken down, through natural biological processes are known as biodegradable materials.

Microorganisms, such as bacteria and fungi, play a key role in decomposing these substances.

Analysis of Options

• Biodegradable: This term accurately describes materials that undergo decomposition via biological means.
• Soft material / Hard material: These terms refer to the physical texture or state of a material, not its susceptibility to biological degradation.
• Non-biodegradable: This describes materials that resist decomposition by biological processes, persisting in the environment for long periods.

Conclusion

Therefore, substances degraded easily by biological processes are called biodegradable.