T RANSPORT OF WATER & NUTRIENTS IN PLANTS Biology ATAR Unit 2 Chapter 12 Pages ;

V ASCULAR T ISSUE Xylem and phloem are tubular pathways through which fluids flow. They form the circulatory system of plants Xylem and phloem vessels are found in the roots, stems and leaves of plants are referred to as vascular tissue Vascular tissue is found extensively throughout the plant, from the root tips to the ends of leaves

X YLEM Xylem transports water and nutrients absorbed from the roots It is made up of 2 cell types: tracheids and vessel elements They are tubular in shape and have pitted walls Lignin As xylem cells mature, they die and leave behind hollow cells supported by the remaining cell wall Wood is composed entirely of xylem tissue

P HLOEM Phloem is conductive tissue involved in the transport of sugars (sucrose) There are 2 types of phloem cells: sieve cells and companion cells Phloem cells are living cells with no nucleus or mitochondria and are connected to each other by sieve holes Phloem is located outside the xylem in woody stems and forms the inner part of the bark When a tree is ringbarked, it cuts the phloem tissue and causes the tree’s death

A CTIVITIES TO DO Plant Nutrition and Transport 14mins watch?v=bsY8j8f54I0 Biozone: Transport in Plants pg 137 Stems and Roots pg 138/139 Uptake by the root pg 140 Xylem and Phloem pg 141 Translocation pg 145