Which tool would scientists most likely use to study the interior details of organelles?

• A. Light Microscope
• B. Electron Microscope
• C. Dissecting Microscope
• D. Stereoscope

Answer: (B)

To see the inner details of organelles, you need extremely high resolution imaging. Light microscopes use visible light, which limits their resolving power to about 200 nanometers, so many interior organelle features (like mitochondrial cristae or nuclear substructures) can’t be seen clearly. Electron microscopes overcome this limit because electrons have much shorter wavelengths, giving access to nanometer-scale detail. For looking inside organelles, the transmission electron microscope is the tool of choice, since it passes electrons through thin sections to reveal internal ultrastructure. In contrast, surface-focused tools like scanning (or dissecting) microscopes provide only exterior views and are not capable of resolving internal features at the organelle level. So the electron microscope best reveals interior details.