Unit 2 Harmful micro-organisms Learner’s Book pages 52–55 Unit overview


In this unit, learners find out how micro-organisms cause disease. They will learn how diseases are spread and about some ways of preventing their spread. They also explore the role of scientists in developing cures for some of the diseases.


Teaching guidelines Ask learners to brainstorm examples of harmful micro-organisms.


TIP!


Mention some well-known diseases such as HIV, diarrhoea and TB, and ask learners if they know what causes these.


Background knowledge


Malaria is caused by a protist parasite and spread by mosquitoes. HIV is caused by a virus, TB is caused by bacteria that infect the lung and most diarrhoea in young children is caused by a virus.


Activity 1 Write about one disease caused by a micro-organism Learner’s Book page 53 Guidelines to implement this activity


• This is an individual activity. • Take learners to the library and ask them to research a disease caused by a micro- organism on the internet and/or in books.


• Check that the disease each learner is going to write about is in fact caused by a micro-organism and not something else.


Assessment guidelines


• This activity is intended for informal assessment. • Use the criteria below to assess learners. Give learners feedback on their


performance to prepare them for formal assessment. Criteria


The learner(s): selected a disease caused by a micro-organism.


included the cause, effects, symptoms and treatments of the disease. wrote in a logical manner.


49 Yes


3 3 3


Partly


2 2 2


No


0 0 0


Total: 9 marks


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