Describe the modifications of the stem for climbing.

(N/A) In plants like $Passion \text{ } flower$ (Passiflora), $Cucurbita$ (pumpkins), $Bitter \text{ } gourd$, $Gourd$, $Cucumber$, $Watermelon$, and $Grape \text{ } vines$, the axillary bud develops into a thin, slender, and spirally coiled structure called a stem tendril.
These tendrils help the plant to climb by coiling around a support.
Such plants are known as climbers.