Question

which best describes the difference between protists that have cilia and those that have flagella?

• those that have cilia are animal - like protists, and those that have flagella are plant - like protists.
• those that have flagella are animal - like protists, and those that have cilia are plant - like protists.
• those with cilia move using hair - like extensions, and those with flagella move using a single whip - like extension.
• those that have cilia are heterotrophs, and those that have flagella are autotrophs.

Explanation:

Cilia are hair - like structures that aid in the movement of protists. Flagella are long, whip - like structures that also aid in movement. The key difference between protists with cilia and those with flagella is the structure they use for movement.

• Option 1: Both animal - like and plant - like protists can have cilia or flagella. For example, paramecium (animal - like) has cilia and euglena (plant - like) has flagella. So this option is incorrect.
• Option 2: Similar to option 1, the type of protist (animal - like or plant - like) is not determined solely by cilia or flagella. So this option is incorrect.
• Option 3: Cilia are short, hair - like extensions and flagella are long, whip - like extensions. This correctly describes the difference in their movement structures.
• Option 4: Both heterotrophs and autotrophs can have cilia or flagella. For example, some heterotrophic protists (like paramecium with cilia) and some autotrophic protists (like euglena with flagella). So this option is incorrect.

Answer:

C. Those with cilia move using hair - like extensions, and those with flagella move using a single whip - like extension.