Chapter 2 – Chapter 2 – Plant Structures Plant Structures and Functionsand Functions

Lesson 2 –Lesson 2 –Plant Transport Plant Transport

SystemsSystems

How do different How do different materials move in materials move in plants?plants?•RootsRoots– xylemxylem: moves water and : moves water and minerals minerals upup from roots to from roots to the stem the stem

– phloemphloem: carries sugar: carries sugar from leaves from leaves downdown the the stem and into roots stem and into roots

How do different How do different materials move in materials move in plants?plants?•RootsRoots– taproots: thick; grow taproots: thick; grow deepdeep (carrots, beets) (carrots, beets)

– fibrous roots: thin (grass)fibrous roots: thin (grass)– prop roots: finger-likeprop roots: finger-like (corn) (corn)

What is the transport What is the transport system made of?system made of?•Xylem and phloem Xylem and phloem

continue up from the continue up from the roots all the way through roots all the way through the stem.the stem.

•cambiumcambium: layer in stem : layer in stem where new xylem andwhere new xylem andphloem are made.phloem are made.

Tree RingsTree RingsBark (protective outer layer)Bark (protective outer layer)

phloephloemm

xylemxylem

•A ring of xylem grows A ring of xylem grows every year, so you can every year, so you can count the rings to count the rings to determine the age of the determine the age of the tree.tree.

Tree RingsTree Rings

All images courtesy of All images courtesy of Microsoft Office Online.Microsoft Office Online.