Cell– Basic unit of life

May 20th, 2015
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Cell wall – The rigid structure that surrounds the plasma membrane of plant Centriole – Pair of small cylindrical structures made out of a complex arrangement of microtubules, outside the nucleus that form spindle fibres during cell division in animal cells.

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1. Using a table, describe each of the five groups of pathogens mentioned under the following headings: characteristics, example of diseases in humans, examples of diseases in crop plants. 20 marks pathogencharacteristicsExample of disease in humanExample of disease in cropsVirus They are minute particles composed of nuclear material enclosed in a protein coatCommon cold, influenza, chicken poxs and cold sores, polio, herpesYellow mosaic, bunchy top of pawpaw, ratoon stunting of sugar cane Bacteria Single cells lacking a true nucleus. Produce enzymes which destroys hosts cellsSmallpoxs, cholera, typhoid, tetanus, whooping cough, syphilis, Bacteial wilt of tomato, bacterial spot of pepper, leaf scald of sugar caneFungiBody consists of a network of hyphae. Destroys host tissues bt extracellular digestionAthletes foot, ringworm, aspergillosis, histoplasmosis, thrushSmut, armillaria root rot, black rot, bitter rot, anthracnose of yam and mangoProtozoans Single cells with a true nucleus.Amoebiasis, giardiasis, african sleeping sickness2. Describe one example of each of the four main types of diseases under the following headings:Disease Cause Symptoms and signsMethod of prevention Pathogenic diseaseA virus invades the body by contact with infected personHigh fever, tiredness, headache, vomitingPrevent over rowding and exposure to the virus.Deficiency diseaseA deficiency disease is caused by a shortage of a parti

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