Which tool would a scientist use to observe subcellular organelles in detail

• A. Light microscope
• B. Ultrasound device
• C. Electron microscope
• D. Dissecting microscope

Answer: (C)

To see subcellular organelles in detail, you need very high resolution beyond what light alone can provide. Light microscopes are limited by the wavelength of visible light, giving about 200 nanometer resolution, which lets you view whole cells and larger organelles but not the fine internal structures. Electron microscopes use beams of electrons, which have much shorter wavelengths, enabling imaging at the nanometer scale. This higher resolution reveals internal features like mitochondria, ribosomes, and membranes clearly.

Among the options, the tool that uses electron beams to reveal internal cell structures is the best choice. The light microscope and dissecting microscope can show cells or external features but not the detailed internal organelles, and ultrasound imaging operates at a macroscopic level and isn’t used for observing subcellular details. If you want even more detail on surface versus internal structure, TEM shows internal ultrastructure and SEM shows surface topology, both falling under electron microscopy.