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By Pauline Alderson, Martin Rowland

Revised in attention of alterations made within the ULEAC syllabus B for Biology and the improvement of the nationwide Curriculum for technology, this publication emphasizes the purposes of Biology. it's been up-to-date all through with sections increased and extra to supply updated details.

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Immediately withdraw the loop and close the lid. H you drop any Rhizopus, pour some of the sodium-cblorate(l) solution over it and inform your teacher. 6. Put the wire of the inoculating loop back into the Bunsen flame until it glows and then put it down to cool. 7. Stick two short pieces of adhesive tape across the edge of the dish to fix the lid to the base. Do not seal the lid all the way round the dish. 8. Put your dish, base uppermost, in the incubator at 25°C. Wash your hands before leaving the laboratory.

Yet it is claimed that it is more economical to use biological washing powders than ordinary ones.

4. Suggest how you could adapt this experiment to test the hypothesis that temperature affects the growth rate of Rhizopus. The adapted experiment is suitable for an Individual Study. 1 Growth requirements In order to grow, microorganisms need o water o suitable food o a suitable temperature o a suitable pH (suitable acidity or alkalinity) o surroundings of a suitable concentration Different microorganisms have different needs. Some need a good supply of oxygen; others can grow only if oxygen is absent.

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