HORTICULTURE

Detailed explanation-1: -Nano-size objects are smaller than the wavelength of light and because of this they cannot be viewed with a light microscope. Special tools are needed to see nanoscale objects, one of which is the scanning electron microscope.

Detailed explanation-2: -Scanning Electron Microscope (SEM) This technique allows you to see the surface of just about any sample, from industrial metals to geological samples to biological specimens like spores, insects, and cells.

Detailed explanation-3: -Elicit from students that nanoscale objects include DNA molecules and single carbon atoms, which are so small they can’t be viewed with optical microscopes. This is because the wavelength of visible light is too big (400-750 nanometers) to reflect off them and make them visible to the human eye.

Detailed explanation-4: -The high-resolution scanning electron microscope (SEM) is excellent for nanoparticle size and shape characterization, because the necessary sample preparation and image acquisition are relatively quick and simple.

Detailed explanation-5: -Electron Microscopes (EM) use electron beams instead of visible light, enabling resolution of features down to a nanometer. Several different types of EMs exist, including Scanning Electron Microscopes(SEM), Transmission Electron Microscopes (TEM), and Scanning Transmission Electron Microscopes (STEM).