In Passiflora, the tendrils are modified
Axillary buds
Upper leaflets
Whole leaves
Stipules
Ginger is an example of underground modified stem called
$A$ : Corm grows vertically beneath soil surface.
$R$ : It bears nodes, internodes, buds & green leaves.
Assertion : Ginger has a prostrate growing rhizome.
Reason : Shoot growth is not effected by gravity
Stem thorns help in
Potatoes develop on