Describe the modification of leaves for specific functions with examples.

(N/A) Modifications of leaves for specific functions are as follows:
$(a)$ Modifications for support and climbing: In some plants with weak stems,leaves are converted into tendrils to help the plant climb,as seen in peas ($Pisum$ $sativum$).
$(b)$ Modifications of leaves for protection: In some plants,leaves are modified into sharp spines to provide defense against herbivores,as seen in cacti.