Presented is one of a series of articles designed to help science teachers keep current on ideas in specific areas in biology. Contained is information on how plants use light for growth, seed germination, and flowering. (PB)

Reported is a technique for chromosome staining that is simple, rapid, inexpensive, and requires little skill for success. (PB)

Discusses the children of Aldo Leopold, their contributions to science and environmental conservation, and the influence of their father's ideas on their lives. (SA)

A procedure is described for providing preparations of dividing cells from root apical meristems, requiring only inexpensive equipment and minimal experimental skill, and using 8-Hydroxyquinoline and Toluidene-blue as a chromosome stain. The method has been sucessfully tested in schools and yields permanent preparations of adequate quality for…

Procedures are described for preparing spores from the fern, water clover, for an educational demonstration of germination and sexual reproduction. The demonstration is recommended for biology instructors who want to illustrate the alternation of phases in plants. (SA)

Describes three basic mechanisms of photosynthetic carbon dioxide assimilation in terrestrial higher plants. A few examples of each type are also included. (HM)

Discusses the history of the use of pesticides and biological control. Introduces the concept of biological control as illustrated in the use of the entomopathogenic bacterium Bacillus thuringiensis and highlights laboratory demonstrations of Koch's postulates. Includes an exercise that offers the student and teacher several integrated learning…

Presents plant and plant ecology lessons designed to raise student awareness of the effects of human trampling on the environment. Involves students working in teams to determine which types of plants are more sensitive to trampling, and designing a method for testing the prediction. (JRH)

Makes recommendations to help students collaborate with classmates to make decisions, grapple with problems, reflect on ethical dilemmas, and maintain relations with customers or business partners to develop social skills and flourish self-esteem. (KHR)

Develops a simple tree-ring laboratory to demonstrate the basics of dendrochronology. Provides two upper-level laboratory exercises primarily intended to demonstrate the specific dendrochronology subdisciplines of dendroclimatology and dendroecology. Suggests using the exercises separately or in unison as part of a multidisciplinary capstone…

Introduces the plant Amaryllis, which is the common name for the Hippeastrum species. Describes how to grow and bloom Amaryllis in soil using hydroponics. Introduces experiments investigating the anatomy of the bulb, growing and elongation rates, the flower, and foliage. (Contains 21 references.) (YDS)

Presents a procedure by which cytokinins are used to induce a population of dividing and differentiating cells on the cut surface of the roots of an intact plant. Includes the method used, results, and suggestions for a variety of variables that may be tested. (RT)

Described is a laboratory study designed to demonstrate loss of vegetation, alterations in the species composition of a community, and the impoverishment of a community with respect to desirable food plant species when herbivore feeding exceeds the rate of vegetation regrowth. The laboratory uses a classroom aquarium. (CW)

Reports on the development and evaluation of a two-component mnemonic strategy for teaching hierarchical and specific botanical concepts. Reports that compared to traditional instruction, mnemonic instruction facilitates learning of both classification and characteristic information, as well as inferential thinking on a problem-solving task. (RS)

Describes a self-contained computer application constructed using the SuperCard development tool which introduces the characteristics of turfgrass species and their optimum environments. Evaluates students' gain in understanding turf species characteristics through this approach. (LZ)