This teaching manual outlines a biology lesson for 9th standard students about how water and carbon dioxide enter leaves. The lesson will use discussion, demonstrations with a pepper plant and diagrams to help students understand the concepts. Water enters the roots through root hairs via osmosis and moves up xylem vessels. Carbon dioxide enters the leaves through pores called stomata. The students will learn about these processes, identify plant structures, and develop an understanding of how plants transport water and carbon dioxide into their leaves.