The aim of this lecture is to present on Plants Structure and Functions. Leaves are designed to allow carbon dioxide to get to the main chlorophyll layer at the top of the leaf. They have small holes called stomata on the under surface. Here briefly describe on Structure of plants – Leaves, stem and roots. Functions of leaves: Trap light energy for photosynthesis; Producing sugar from photosynthesis; Finally describe on Exchange of gases; Roots – function and structure and Root hair cells.