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What are cilia ?...

What are cilia ?

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### Step-by-Step Text Solution: 1. **Definition of Cilia**: Cilia are hair-like projections or outgrowths found on the free surface of certain cells. 2. **Occurrence in Organisms**: Cilia are present in both lower organisms, such as ciliated protozoa (e.g., Paramecium), and in higher organisms, including humans and other animals. 3. **Structure in Protozoa**: In ciliated protozoa like Paramecium, the entire outer surface is covered with these hair-like projections, which aid in movement and feeding. ...
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