Mycorrhizae are among the most common examples of mutualism. This article discusses their structure, symbolic relationship, factors affecting formation and applying research. Questions are posed and answers suggested. (MA)

Summarizes current work on the study of plant hormones, with specific emphasis on the auxin indolylacetic acid and on gibberellic acid. (PEB)

Introduces sequoias, the largest tree species, and describes the importance of fires in sequoias' successful reproduction and management of the sequoia ecosystem. (Contains 23 references.) (YDS)

Discusses some of the remarkable capabilities and fascinating behavior of plants. Describes several simple experiments that young scientists can accomplish with plants to demonstrate their ability to sense, react, and adapt to their environment. (JJK)

Research in photosynthesis is revealing a number of possible ways to increase the efficiency of carbon dioxide assimilation by crops and thus increase yields, a necessity in times of growing population and shrinking agricultural land. (Author/BB)

Explains the mechanisms and describes the processes that underlie gravitropism in roots. Reviews experimental efforts and investigative results that explored the causes of root behavior. (ML)

Discusses the importance of the electron microscope, and in particular the scanning electron microscope, in studying the surface topography, sectional substructures, and patterns of development of pollen grains. The production, dispersal methods, and structure of pollen grains are described and illustrated with numerous electron micrographs. (JR)

Suggests science activities using amaryllis plants. Includes information on growing the plant and its annual growth cycle. (SK)

Describes a simple and inexpensive way to construct two small growth chambers for studying phototropism in the science classroom. One chamber is designed to illustrate how plants grow around obstacles to reach light and the other to illustrate directional light responses. (HM)

Topiary is the gardener's ancient art form in which plants are trimmed to form living sculptures. Reports the evolution of the art and the source of recent interest in the art form. (MDH)

Recommends using Amaryllis hippeastrum to teach young children about plant reproduction. Provides tips for growing these plants, discusses the fast growing rate of the plant, and explains the anatomy. (YDS)

Presents directions for an activity designed to illustrate the function of plant nutrients. (PEB)

Presents an attempt to explore plant chimeras and to demonstrate the separation of genetically distinct tissue in a chimera using an easily grown scented geranium plant. (HM)