Chapter 23: Roots, Stems, and Leaves. The three principle organs of seed plants. Roots absorb water and dissolved nutrients a nchor plants in the ground h old plants upright through wind and rain Stems support the plant t ransports nutrients to the rest of the plant
The three principle organs of seed plants
The only plant tissue that produces new cells by mitosis
Apical meristem is found at the tips
of stems and roots.
Dermal tissue – generally consists of a single layer of epidermal cells.
The outer layer is often covered with a thick, waxy layer called the cuticle, which protects against water loss and injury.
Vascular tissue – contains several different cell types; transporting water and nutrients around the plant.
Ground tissue – cells that lie between the dermal and vascular tissues.
Roots absorb water and dissolved nutrients from the soil. Plants have a one-way system to generate enough pressure to move water out of the soil and into the body of the plant.
The water has no where else to go, but UP!
Root hairs increase surface area!
Leaves are attached to a stem at structures called nodes.
Some stems can also
carry out photosynthesis
Read p. 592
The most important “stem” is the stem of the tree.
Wood is actually layers of xylem!
The loss of water from a plant through its leaves
Maple tree leaves
Black Walnut tree leaves