Biology: The Unity and Diversity of Life (14th Edition)

Published by Brooks/Cole Publishing Co.
ISBN 10: 1305073959
ISBN 13: 978-1-30507-395-1

Chapter 27 - Self-Quiz - Page 466: 6


c. dermal

Work Step by Step

The first dermal tissue that forms is called the epidermis; it is typically just one layer thick. A wax-like substance is secreted from the outside surface of the epidermal cell to help keep water from being lost. In leaves and young stems, the epidermis contains special cells that control openings to allow water vapor and gases to diffuse through. The periderm replaces the epidermis when the stem and roots get older.
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