[PDF] 2005 Key Stage 2 Year 6 - English Spelling Test Levels 3-5 Teachers Version.pdf | Plain Text

Spelling Test Bacteria Teacher’s Version ENGLISH KEY STAGE 2 2005 SPELLING LEVELS 3–5 264764_2005 Spell Teacher.qxd 20/6/05 12:11 pm Page 1

2 Bacteria The importance of their hands a meal is emphasised to small children as a way of keeping . But do you ever think about germs and ? It is true that some bacteria, and other micro-organisms, can cause problems, but most bacteria are not especially harmful. In fact, without bacteria, there would be no life on Earth as we know it. Bacteria that live in soil break down, or decompose, the remains of dead plants and animal . In the , the bacteria make substances to be used by living plants as they grow. These pass to the animals that eat the plants. Of course the bacteria do not do this to be helpful; it is just the way they obtain the energy they need to . washing available before essentialprocessmaterial healthy disease serious survive 264764_2005 Spell Teacher.qxd 20/6/05 12:11 pm Page 2

3 Some bacteria live in the digestive systems of humans and animals. This benefits the bacteria as they have a regular of food, and benefits humans and animals as the bacteria nutrients from the food that would otherwise pass through them. Humans have found many ways to turn some extraordinary bacteria and other micro-organisms to our . We use the of bacteria to produce milk and to make cheese, butter and yoghurt. Bacteria can also be used in to stop the effects of other bacteria that cause illness. No one knows how many of bacteria there might be, or what they could all be used for. But one thing to is that if we, or any other organism, can benefit from this it may be more by chance than . supply release surprising advantage properties medicine physical varieties remember design 264764_2005 Spell Teacher.qxd 20/6/05 12:11 pm Page 3

264764 © Qualifications and Curriculum Authority 2005 QCA key stage 2 team, 83 Piccadilly, London W1J 8QA Order refs: QCA/05/1363 (pupil pack) QCA/05/1360 (mark schemes pack) 264764_2005 Spell Teacher.qxd 20/6/05 12:11 pm Page 4