The Nature of Disease Causing Organisms :: essays research papers

The nature of disorder CAUSING ORGANISMS and the mechanisms employed by man to combat these organisms.What is distemper? A disease is a disturbance in the normal structure or function of an organism, group of organisms or the entire body. Diseases pretend different organisms in different ways, they may be temporary, they may be chronic, or they may be terminal. They may even be localized or wide outflank through an entire body. Many diseases have been eradicated, but, some have no cure. Humans and other vertebrates have a system of specific opposition to combat disease. Some disease do organisms invade body tissues and thus destroy them, while others setup a symbiotic relationship with the cells. intimately communicable diseases are caused by microorganisms or larger parasites that are usually called germs, most scientists call them pathogens.What kinds of disease are there, that are caused by organisms? -Infectious disease- caused by living organisms, can be passed by con tact.-Viral disease- caused by viruses, difficult to finesse because viruses are non-living-Fungal disease- usually cause mild infections, difficult to treat-Protozoan disease- the "tropical diseases" caused by protozoa-Worm infections- mostly in the tropics, worms inside body causing damage-Diseases can be caused by a wide renewal of bacteria, viruses, fungi, protozoans, and parasitic worms. Some sferre some disease causing organisms, and how do they affect plants? Plant diseases can be caused by microorganisms, parasitic flowering plants, nematodes, viruses, or adverse environmental conditions. Bacterial diseases are marked by symptoms much(prenominal) as soft rot, leaf spot, wilt of leaves and roots, cankers, leaf and twig blight, and scratch formation. Most plant diseases are caused by fungi. Fungal diseases have been record on since biblical times. Fungal diseases are characterized by leaf spots, unhealthy lesions, blights, powdery mildew, cankers, root rots, wilt s, and club root. Viral diseases are infectious and spread largely by insects. All economic plants suffer from one or more viral diseases. Symptoms include mosaic patterns, yellowing of foliage, vein clearing, ring spots, hinder and premature death, malformations and overgrowth. Nematodes, or roundworms, are a large cause of disease in plants. They live in and cause damage to the roots, stems, leaves, and bulbs of plants.