Identify the treatment and measured response, compare whole extract with purified compounds and distinguish plausible traditional use from proven clinical efficacy.
Boards used for chopping fruit and vegetables can be made from wood or oil-based plastics.
The photograph shows some chopping boards.
The number of bacteria surviving on boards made from different materials was investigated.
Identical bacterial cultures were placed on boards made of pine wood, spruce wood and plastic. The graph shows the number of bacteria surviving after bacteria were placed on the boards and kept in the same conditions.
Suggest one reason for the difference in bacterial survival on the pine chopping board and on the plastic chopping board.
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