Question

what are cilia and flagella?tell their importance.

Answer 1

Function. Cilia and flagella move liquid past the surface of the cell. For single cells, such as sperm, this enables them to swim. For cells anchored in a tissue, like the epithelial cells lining our air passages, this moves liquid over the surface of the cell (e.g., driving particle-laden mucus toward the throat).

Answer 2

Some cells have these small extensions on their cell membrane.
They help in locomotion and collection of food.
Unicellular organisms like paramecium have numerous cilia while Euglena has a single flagellum.

It's just the explanation.

Hope this is helpful.