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Which of the following is not a stem modification?

1. Pitcher of Nepenthes
2. Thorns of citrus
3. Tendrils of cucumber
4. Flattened structures of Opuntia

Correct answer: Pitcher of Nepenthes

Solution

The pitcher in Nepenthes is a modified leaf used for trapping insects, so it is not a stem modification. The other options are stem modifications or stem-derived structures.

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