A laboratory demonstration is suggested for the formation of a-amylase enzyme in halved grains of barley. Data presented in the article provide some information of the pattern of a- and b-amylase activity during germination. (PS)

Provides construction details for a device to measure growth and phototropism in plants. (CP)

Topics in this discussion of photorespiration (light-dependent oxygen consumption and carbon dioxide evolution from leaves) include: (1) the biochemistry of photorespiration; (2) ribulose biphosphate carboxylase and glycollate synthesis; (3) metabolism of glycollate; (4) plants lacking photorespiratory systems; and (5) advantages of…

Describes classroom activities using algae, including demonstration of eutrophication, examination of mating strains, and activities with Euglena. Includes on algal morphology/physiology, types of algae, and field sources for collecting these organisms. (JN)

Scientific research leading to the discovery of female plants of the red alga Palmaria plamata (dulse) is described. This discovery has not only advanced knowledge of marine organisms and taxonomic relationships but also has practical implications. The complete life cycle of this organism is included. (JN)

Two laboratory procedures in experimental chemotaxonomy are outlined for determining the presence of betalains in genera representing different plant families. A list of materials and equipment needed is provided. (DC)

Described is a student exercise demonstrating plant biorhythms in Albizzia julibrissin. Initial preparation and methods for conducting the exercise are explained, and sample data graphs are included. (CS)

Describes a modification in the use of artificial substrates to study attached micro-algae. Apparatus is based on glass microscope slides immersed in natural water environments; biomass and primary productivity are assessed by measurement of alpha-chlorophyll. Describes use in studies of colonization, succession, and populational fluctuation. (CS)

Describes an exercise which is currently used in a course in cell physiology at Oxford Polytechnic in England. This exercise can give students some idea of the molecular events involved in bringing about movement of chloroplasts (and other organelles) in plant cells. (HM)

Discusses the fact that many food plants derive from domesticated rather than natural strains, and that natural germplasm or genetic strains used in the plant-improvement process must be carefully preserved. (MLH)

Included in this introduction to the study of algae are drawings of commonly encountered freshwater algae, a summary of the importance of algae, descriptions of the seven major groups of algae, and techniques for collection and study of algae. (CS)

Describes an experimental project that uses plant tissue culture techniques to examine cell differentiation in the carrot. Allows students to gain experience in some important techniques and to explore fundamental questions about cell differentiation. (DDR)

Presents a creative way to teach photosynthesis. Revolves around the growth of a lily planted and stored in the classroom. Combines the concepts of particle theory, transformation, and changes of phase and mass in a holistic approach. The six-step teaching sequence is founded on the notions of challenge, variation, and drama. (Author/NB)

Describes a project in which students collect native seeds and build a greenhouse to propagate native plants in a desert laboratory. (DDR)

Presents an activity to create a garden to attract butterflies and hummingbirds. Students increase their environmental awareness and discover the rewards of community service. (NB)