6th Grade · Science · Activity · shared by Luke Morgan
This 6th Grade Science activity helps students sort biofilm facts from myths, distinguishing evidence-based data from opinions.
📋 Fact vs. Opinion Sort
Name: _________________________ Date: _____________
Topic: Sorting Facts and Myths About Pond Scum and Biofilms
Understanding the difference between a fact and an opinion is a key skill in science. A FACT is a statement that can be proven true or false using evidence, data, or observation. An OPINION is a statement that expresses a personal belief, feeling, or judgment that cannot be proven.
Key Facts: The Science of Slimy Surfaces
Many individuals mistakenly assume that the green film on a pond or the pink slime on a shower curtain is merely accumulated dirt, but these are actually complex biological communities called biofilms . A biofilm establishes itself when microscopic organisms, such as bacteria or algae, settle on a moist surface and anchor themselves using specialized structures. Once they are securely attached, these microbes secrete a sticky, protective substance called the extracellular matrix . This biological glue consists of various sugars and proteins that integrate the community and insulate it from environmental hazards. Scientists have observed that these microbial civilizations are remarkably resilient because the matrix functions as a durable shield against harsh chemicals and temperature fluctuations.
While some people perceive pond scum as unpleasant, these biofilms provide significant environmental benefits by filtering water and offering essential nourishment for small aquatic organisms. In residential environments, the pink residue frequently observed in bathrooms is typically a bacterium known as Serratia marcescens . This specific organism thrives in humid conditions and survives by consuming phosphorus or fatty substances present in soaps and shampoos. Understanding the sophisticated nature of these microscopic layers…