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Gill, John; Badcock, Margaret – Journal of Biological Education, 1990
Presented is a cytogenic technique which enables students to produce preparations of dividing cells. Described are materials, methods, typical results, and assessment for this activity. The usefulness for a wide range of ages and abilities is stressed. (CW)
Descriptors: Biological Sciences, Biology, Cytology, High Schools
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Gill, John; And Others – Journal of Biological Education, 1988
Describes laboratory procedures for observing the progressive change deciduous leaves undergo prior to abscission. Outlines the starch test, sugar test, extraction and chromatography of pigments, and experimental results. States that obtained results enable the events of leaf senescence to be correlated with the carbohydrate economy of a tree in…
Descriptors: Biology, Botany, Chromatography, College Science
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Gill, John; Howell, Pauline – Journal of Biological Education, 1985
The easily obtained common snail shows interesting dietary preferences which can be the source of several simple experiments. Specific student instructions are given for quantitative and comparative studies using cabbage, lettuce, carrot, rutabaga, and onion. Suggestions for laboratory setup and further work are included. (DH)
Descriptors: Biology, Junior High Schools, Laboratory Animals, Laboratory Procedures
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Gill, John; Markby, Jane – Journal of Biological Education, 1991
A method for demonstrating eutrophication that can be used as a simple illustration of the phenomenon or as a basis for problem-solving activities is presented. A sample worksheet with procedures for this activity and discussion questions is included. (Author/KR)
Descriptors: Biology, Environmental Education, Problem Solving, Science Activities
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Gill, John – Journal of Biological Education, 1982
Describes a method for the extraction and bioassay of natural germination inhibitors, requiring only inexpensive equipment and minimal experimental skill. The method has been used to demonstrate qualitative/quantitative differences in germination inhibitor levels in a variety of different fruits or in different tissues within a single fruit.…
Descriptors: Biology, Botany, High Schools, Laboratory Procedures