Ocr A Level Biology - Communicable Diseases Questions And Answers 100% Verified A+ Guaranteed

autoimmune diseases {Ans: occur when the immune system attacks a part of the body, caused by genetic and environmental factors}black sigatoka {Ans: causes leaf spots on banana plants reducing yield, fungus}primary defences {Ans: those that prevent pathogens entering the body}vector {Ans: an organism that carries a pathogen from one host to another}protoctista {Ans: a number of diseases caused by animal-like protoctists, these organisms usually cause harm by entering host cells and feeding on the contents as they grow}bacteria {Ans: belong to prokaryotae kingdom, can reproduce rapidly, cause disease by damaging cells or by releasing waste products/toxins that are toxic to the host, in plants they often live in vascular tissues and cause blackening and death of these tissues}