Doctors, nurses and health staff have to face occupational hazards, including infectious diseases, contaminated puncture wounds, radiation, solvent and chemical exposures, and psychological stress among others.
Most of us know and understand that all green plants are capable of preparing their own food--glucose--using carbon dioxide from the atmosphere and water from soil in presence of either sunlight or some other forms of light, during the process called Photosynthesis. Besides preparing food, they also oxygenate the atmosphere. This ability is due to the presence of green color called chlorophyll found in these plants. Non-green plants such as mushrooms that fall under a group called fungi cannot make their own food as they lack this green pigment and thus they break down the organic content of the earth.