Many organisms produce light using chemicals in a process called ____________.

Many organisms produce light using chemicals in a process called ____________.

• A. Bioluminescence
• B. Chemiluminescence
• C. Fluorescence
• D. Phosphorescence

Answer: (A)

Light produced by living organisms through chemical reactions inside their bodies is called bioluminescence. In bioluminescence, a biochemical reaction—often involving an enzyme such as luciferase and a light-emitting molecule like luciferin—releases energy as visible light. This glow comes from the organism’s own metabolism, which you can see in fireflies, certain jellyfish, and deep-sea creatures. The broader term chemiluminescence covers light from chemical reactions in general, which can occur without any living system (like glow sticks). Fluorescence and phosphorescence, on the other hand, require external light to excite the substance and you typically only see the glow while the external light source is present (fluorescence) or briefly after it’s removed (phosphorescence). So when the light comes from a living organism’s internal chemistry, it’s bioluminescence.

Light produced by living organisms through chemical reactions inside their bodies is called bioluminescence. In bioluminescence, a biochemical reaction—often involving an enzyme such as luciferase and a light-emitting molecule like luciferin—releases energy as visible light. This glow comes from the organism’s own metabolism, which you can see in fireflies, certain jellyfish, and deep-sea creatures. The broader term chemiluminescence covers light from chemical reactions in general, which can occur without any living system (like glow sticks). Fluorescence and phosphorescence, on the other hand, require external light to excite the substance and you typically only see the glow while the external light source is present (fluorescence) or briefly after it’s removed (phosphorescence). So when the light comes from a living organism’s internal chemistry, it’s bioluminescence.