NEET BIOLOGY

Detailed explanation-1: -Scanning electron microscopy has been used to observe and study parasitic protozoa for at least 40 years.

Detailed explanation-2: -Protozoa are single-celled eukaryotes that ingest food (algae and bacteria) by phagocytosis and generally move via pseudopods (flowing extensions of the plasma membrane) or whip-like flagella. Most are too small to be seen with the naked eye, but can easily be found under a microscope.

Detailed explanation-3: -While some eucaryotes, such as protozoa, algae and yeast, can be seen at magnifications of 200X-400X, most bacteria can only be seen with 1000X magnification.

Detailed explanation-4: -Use a pipet to take a sample of the water and place 1-2 drops on a plain microscope slide. Cover the drops with a coverslip. Examine the slide with your microscope starting at 40x. Most protists have little color and are difficult to see in bright light, so turn your microscope diaphragm to the lowest light setting.

Detailed explanation-5: -The Wheatley Trichrome technique for fecal specimens is a modification of Gomori’s original staining procedure for tissue. It is a rapid, simple procedure, which produces uniformly well-stained smears of the intestinal protozoa, human cells, yeast, and artifact material.