A potato is cut into a number of small pieces, these potato pieces are placed on wet cotton kept in a tray . After a few days, green shoots and roots appear only from some potato and not from all potato pieces. Why?

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Solution

The pieces of potato that bear nodes only can give rise to the new plants by producing shoots and roots. But the pieces not bearing nodes cannot produce new plants. Thus to form a whole potato only some pieces that bear nodes give rise to roots and shoots.

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