Torreya, Vol. 3 (Classic Reprint) - Softcover

Inhaltsangabe

A practical look at classroom physiology demonstrations for plant science. This installment presents improvised yet effective apparatus for showing how plants take up carbon dioxide under light. The notes describe a modified gas analysis setup based on the Winkler-Hempel method, built to be workable in a teaching lab, with clear steps and considerations for accuracy.

Author George E. Stone shares hands-on detail from his own practice, including how to assemble, operate, and troubleshoot the equipment. The article emphasizes accessible design—using readily available parts, small stop-cocks, and a bulb burette—to help students directly observe gas exchange in plant tissue. It also covers adaptations for potted plants and practical tips to minimize measurement errors.

• How to measure carbon dioxide uptake by plant tissues under light using a bulb burette assembly.


• Step-by-step operation that connects apparatus setup, timing, and data interpretation.


• Design considerations to improve accuracy and reduce leakage in a teaching lab.


• Options for demonstrating gas exchange with both liquid and mercury methods.

Ideal for students of physiology and botany, and for instructors seeking practical, low-cost demonstrations in early laboratory courses.

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