Final answer:
Fluted filter-paper increases the efficiency of filtration by allowing the liquid to pass through only one layer of paper and run freely down the side of the paper in the filtration funnel.
Step-by-step explanation:
Filtration is the process of removing solids from a fluid by passing it through a porous medium. In this case, fluted filter paper is used as the porous medium.
The fluted design increases the efficiency of filtration because the liquid only has to pass through one layer of paper at all points and runs freely down the side of the paper inside the filtration funnel. This allows for faster and more effective filtration.