Consider the following statements:1. Biofilms can form on medical implants within human tissues.2. Biofilms can form on food and food processing surfaces.3. Biofilms can exhibit antibiotic resistance.Which of the statements given above are correct?
✓ Correct answer: d) 1, 2 and 3
ExplanationA biofilm is a collection of microbial cells that are encased in a polysaccharide-based matrix and are permanently attached to a surface (i.e., cannot be removed by gentle rinsing).Microorganisms that form biofilms include bacteria, fungi, and protists.Noncellular materials such as mineral crystals, corrosion particles, clay or silt particles, or blood components, depending on the environment in which the biofilm has developed, may also be found in the biofilm matrix.Statement 1 is correct: Biofilms may form on a wide variety of surfaces, including living tissues, food and food processing surfaces, indwelling medical devices (devices in the body like catheters, heart valves), human and animal tissue, industrial or potable water system piping, or natural aquatic systems.Statement 2 is correct: Biofilms are a significant concern in the food industry, forming on surfaces such as cutting boards, conveyor belts, and food packaging equipment.Contaminated biofilms can lead to foodborne illnesses caused by pathogens like Listeria monocytogenes, Salmonella, and Escherichia coli.Statemen
Practice more Science PYQs
Attempt a free 10-question quiz or browse the full Science & Technology previous-year-question bank with instant answers and explanations.
🔬 Science PYQs →