Describes the diffusion of water molecules with terminology adopted from the physical sciences. Presents a set of student exercises (with answers) relating to the topic. (SK)

Describes an environmental education program for grades seven, eight, and nine. The program stresses mastery learning and projects are selected to give students a chance to use skills in real situations. Includes a description of a student-built greenhouse. (MA)

Described is an activity that uses discarded evergreen trees from Christmas. Tree age and growth characteristics are investigated by looking at the number of whorls and rings of the trunks. Extensions and follow-up activities are included. (KR)

Evaluated is the impact of the landscape upon children in 21 schools in England. Past and present experiences of 8- to 11-year-old children were measured. Results indicate that both past and present experiences make a small but significant contribution to the children's development of botanical knowledge and environmental dispositions. (Author/CW)

Described is a simple technique to monitor air pollutants and to simulate some of the features of roadside canopies. Included are the procedures, directions for the assembly of the apparatus, and a discussion of typical results. Graphs of sample data are presented. (CW)

Provides instructions and diagrams for making a life-sized morpho butterfly to wear on the finger and a paper bromeliad. Includes a pattern for copying. (RT)

Lichenometry is described for use in the study of biology and physical weathering. Discussed are lichens in general and an outline for studying growth and ecology. A problem solving format is used. (CW)

Reports on an investigation of a population of dandelions on a school lawn. Describes the objectives, rationale, study area, and the results of the study. Includes tables and graphs that show data collected. (RT)

Reported are the differences in the understanding of concepts involved in photosynthesis and its role in ecology between students who had studied advanced biology and those who had not. Reports that the less experienced students had a poorer understanding of autotrophic respiration and energy aspects of photosynthesis. (CW)

Describes a procedure for the growth of tobacco plants in flasks. Demonstrates plant tissue culture manipulation, totipotency, and plant regeneration in approximately 12 weeks. Discusses methods, materials, and expected results. (CW)

Botany meets computer science in this activity, which challenges students to create a computerized seed catalog. Class members work together to develop a database of plants, much like the major seed companies do. (PR)

Discusses the significance of the decisions made at the Eighth Convention on the International Trade of Endangered Species (CITES) when governmental delegates and nongovernmental organizations from around the world decided the fate of potentially threatened and endangered species of plants and animals. Particular emphasis is placed on the politics…

Investigations that facilitate experimental design, the concept of replication, data analysis, and other aspects of scientific study are described. A list of materials, the recommended plants, and the directions for building the hydroponics unit are included. (KR)

Examples from research that incorporate plants to illustrate biological principles are presented. Topics include dried pea shape, homeotic genes, gene transcription in plants that are touched or wounded, production of grasslands, seaweed defenses, migrating plants, camouflage, and family rivalry. (KR)

Describes experiments by Thomas A. Knight on geotropism. These experiments took place about 200 years ago and used a centrifuge. (PR)