Yeast – Dead or Alive?

Yr. 6 have been looking at microorganisms this term, they have identified the seven life processes and realised that if yeast is alive it would be able to do all seven of these life processes.  This week they investigated what yeast needed in order to stay alive and what conditions it thrived in.  They found that yeast needed moisture and preferred to have warmth and sugar as well.  In these conditions there was evidence of the yeast respiring which created a large head of froth in the test tubes.  Yr.6 then used this knowledge to blow up balloons simply by giving the yeast perfect conditions in which it could respire, thus producing carbon dioxide which blew up the balloons.  Some great scientific skills were shown by all.

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