Variations on a Theme

Covers plant domestication and life cycles stressing the great variety in types of plant growth and development, and presents plants as they differ from the normal through selection for man's needs. Shows how adaptations enable plants to withstand unfavorable seasons. Outlines life cycle of perennials and annuals. Depicts sexual and asexual reproduction among plants. Points out modifications in tissues of woody perennials and diagrams a cross section of a woody stem. Highlights the life cycle and alternation of generations of the fern. Points out that plant variations and modifications are successful especially for an animal world dependent upon green plants and photosynthesis. Guest lecturer Dr. Harriet Creighton, Wellesley College., P: Preservation Material CRP: Composite Reversal Positive AC: Acetate B: 800' 16/8/9.5mm 16mm Color Sound 460 Calvin Productions, Inc.