22.1 What Is a Plant?
22.2 Alternation of Generations
22.3 The Evolution of Plants
22.4 Nonvascular Plants
The Moss Life Cycle
Kinds of Nonvascular Plants
22.5 The Significance of Vascular Tissue
22.6 The Development of Roots, Stems, and Leaves
Roots
Stems
Leaves
22.7 Seedless Vascular Plants
The Fern Life Cycle
Kinds of Seedless Vascular Plants
22.8 Seed-Producing Vascular Plants
Gymnosperms
Angiosperms
22.9 The Growth of Woody Plants
22.10 Plant Responses to Their Environment
Tropisms
Seasonal Responses
Responses to Injury
22.11 The Coevolution of Plants and Animals
OUTLOOKS 22.1: Plant Terminology
HOW SCIENCE WORKS 22.1: Using Information from Tree Rings
OUTLOOKS 22.2: Spices and Flavorings
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