Onion stores food in

In which of the following is the stem modified into a tendril?

In $Opuntia$,the stem is modified into a flattened green structure to perform the function of leaves (i.e.,photosynthesis). Cite some other examples of modifications of plant parts for the purpose of photosynthesis.

Examples of twiners $(Stem\, climbers)$ are:

In $Bougainvillea$,thorns are the modifications of

In $Duranta$,axillary buds and in $Carissa$ the apical bud is modified into stem thorns. What is correct for $Ulex$? It has