Plant Structure and Function: Leaves, Stem, Roots, and Gas Exchange, Slides of Biology

Download Plant Structure and Function: Leaves, Stem, Roots, and Gas Exchange and more Slides Biology in PDF only on Docsity! Plants Structure Structure – Leaves stem roots Docsity.com Function of leaves • Trap light energy for photosynthesis Producing sugar from photosynthesis • Exchange of gases – oxygen and carbon dioxide Docsity.com Leaf diagram — palisade layer Upper | Wax Cuticle Epidermis |_ Most ‘ ™ chlorophyll |. « Mesophyll — . Lower | Epidermis | Palisade Mesoaphyll |_ Spongy Mesophyil Docsity.com Leaf cell - palisade Position? Upper surface of leaf Features? Box shape Chloroplasts Function? Photosynthesis Docsity.com Gas exchange • 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 • Each hole is open & closed by 2 guard cells Docsity.com Stomata open and close at different times of the day When it is light the plant needs CO2 for photosynthesis so the stoma open At night (darkness) they close Docsity.com Roots – function and structure • Hold plant in position • Absorb water and minerals from the soil • Specialised cells to increase surface area for water intake Docsity.com Wheat seed Root hairs Fragile parts of cells that grow from the main root They massively increase the surface area for absorption Docsity.com