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Which of the following is not a stem modification?
A
Thorns of citrus
B
Tendrils of cucumber
C
Flattened structures of $Opuntia$
D
Pitcher of $Nepenthes$
Explanation
The pitcher is a leaf modification.
Detailed Solution
$Nepenthes$ is an insectivorous plant; its pitcher is a modified leaf used to trap insects.