Question

which plant part of cactus is converted into spine

Answer 1

Most cactus morphologists have concluded that cactus spines are either modified leaves or modified bud scales (the difference is inconsequential because bud scales themselves are modified leaves). The leaf-nature of spines is certainly understandable from the point of view of location: spine primordia look just like leaf primordia and are produced at a location where we would expect leaf primordia – at the base of the axillary bud’s shoot apical meristem.

Answer 2

Hey...
Leaf part of cactus is converted into spine.
Hope this would help you.
Mark it as brainliest if you like.
@Saadya