Which term describes a process in which active substances are coated by extremely small capsules?

• A. What is "buzz off"
• B. Smart materials
• C. Polymorph
• D. Micro encapsulation

Answer: (D)

Microencapsulation is the process of enclosing active substances within tiny capsules. By forming a microscopic shell around each particle, the core is protected from moisture, oxygen, or heat, and its release can be controlled over time or triggered by specific conditions. This makes the substance more stable, easier to handle, and capable of masking taste or odor. The other terms don’t describe this coating process: a slang phrase isn’t a technical term; smart materials are about substances that change properties in response to stimuli, not about coating; and polymorphs are different crystal forms of a substance, which affects properties but not the creation of micro capsules around the core.