Pupils, please ensure that you understand the difference between underground stem and underground roots. Are you able to state examples of underground stems?
http://www.practicallyedible.com/edible.nsf/encyclopaedia!openframeset&frame=Right&Src=/edible.nsf/pages/rootvegetables!opendocument
http://en.wikipedia.org/wiki/Underground_stems
http://www.answers.com/topic/sweet-potato
http://www.tuhsd.k12.az.us/Desert_Vista_HS/academics/Science/Biology/standard/botveg.htm
PS: There is a difference between sweet potato and potato. One of them is an underground root while the other is an underground stem.
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