First slide
The Stem
Question

Assertion: Tendril of grapevine is a stem modification.

Reason: Tendril of grapevine is demarcated into nodes and internodes.

Easy
Solution

Tendrils of grapevine are modified aerial axillary buds (actually terminal buds). But they are not demarcated into nodes and internodes. Such modified stems which externally loose their stem identity are called metamorphosed stems. 

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