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Download Pathogens and spread of disease - Questions Q1. Cholera is a
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Pathogens and spread of disease - Questions Q1. Cholera is a disease caused by a pathogen. (i) State the type of pathogen that causes cholera. (1) .............................................................................................................................................. (ii) Complete the sentence by putting a cross ( The cholera pathogen is spread ) in the box next to your answer. (1) A B C D in air by houseflies by mosquitoes in water Q2. The female mosquito can carry the Plasmodium protoctist. This protoctist causes malaria in humans. When the female mosquito breaks the skin of a person the Plasmodium is transferred into the blood of that person. (i) State the name of this type of disease transmission. (1) .............................................................................................................................................. (ii) The survival of the Plasmodium is dependent on living in the blood of another species. This relationship is an example of (1) .............................................................................................................................................. (iii) Plasmodium causes an infectious disease. What is the name given to any disease causing organism? Put a cross ( ) in the box next to your answer. (1) A B C D bacterium lysozyme pathogen virus Q3. The housefly can also carry disease causing organisms. Describe how the housefly spreads disease. (2) .............................................................................................................................................. .............................................................................................................................................. .............................................................................................................................................. .............................................................................................................................................. Q4. * Describe how different pathogens are spread within human populations. (6) .............................................................................................................................................. .............................................................................................................................................. .............................................................................................................................................. .............................................................................................................................................. .............................................................................................................................................. .............................................................................................................................................. .............................................................................................................................................. .............................................................................................................................................. .............................................................................................................................................. .............................................................................................................................................. .............................................................................................................................................. .............................................................................................................................................. Q5. Pathogens are microorganisms that cause disease. Draw one straight line from each disease to the type of pathogen that causes the disease. (2) Pathogens and spread of disease – Questions Mark Scheme Q1. Answer (i) (ii) Acceptable answers Mark (1) (1) bacteria D in water Q2. Question Number (i) Answer Acceptable answers Mark (animal) vector Question Number (ii) Question Number (iii) Answer vector borne vector transmission Acceptable answers (1) Mark parasitism / parasitic Answer parasite(s) Acceptable answers (1) Mark Question Number Answer Acceptable answers A description including two of the following points • housefly picks up organisms from contaminated source / dysentery organisms / disease (1) • the housefly lands on food / vomits on the food / contaminates surface /skin(1) • which people then eat /touch (1) fly lands on faeces eq defaecate eq on food / surface (1) C Q3. Mark (2) Q4. Question Number QWC Indicative Content * Level 1 0 1-2 2 3-4 3 5-6 Mark A description of how pathogens are spread and how they enter the human body in a logical order • cholera bacteria ingested through the drinking of ‘dirty’ water • Salmonella bacteria ingested through contaminated food products / spread by direct contact • influenza virus spread through droplet inhalation/airborne process • athlete’s foot fungus spread by contact with fungal spores • HIV spread by exchange of contaminated body fluids • dysentery infection / bacteria spread through housefly vector • malaria protozoa (6) spread by the Anopheles mosquito No rewardable content • few examples of pathogens are given and/or wrongly linked to their sources of infection or method of transmission • the answer communicates ideas using simple language and uses limited scientific terminology • spelling, punctuation and grammar are used with limited accuracy • there are several examples of pathogens mentioned linked to their source of infection • there is a link to the method of transmission for each of the pathogen • the answer communicates ideas showing some evidence of clarity and organisation and uses scientific terminology appropriately • spelling, punctuation and grammar are used with some accuracy • the majority of the pathogens are mentioned and linked to their source of infection • the method of transmission is described accurately for each of the pathogens • the answer communicates ideas clearly and coherently uses a range of scientific terminology accurately • spelling, punctuation and grammar are used with few errors Q5. Question Number Answer Mark both lines needed for 2 marks (2)