Which of the following is not a stem modification?
(a) Tendrils of cucumber
(b) Flattened structures of Opuntia
(c) Pitcher of Nepenthes
(d) Thorns of citrus
(a) Tendrils of cucumber
(b) Flattened structures of Opuntia
(c) Pitcher of Nepenthes
(d) Thorns of citrus