Plant photosynthesis teaching experiment method

Abstract

The invention discloses a plant photosynthesis teaching experiment method. The method comprises the following steps: a, marking experiment containers: marking three experiment containers with the samespecification; b, weighing algae: respectively putting algae with the same weight into two of the marked experiment containers; c, diluting and sub-packaging the solution: dropwise adding clear waterinto the litmus solution to prepare a purple litmus solution; subpackaging the purple litmus solution into two parts, wherein one part ofthe purple litmus solution is directly sealed, carbon dioxidegas is introduced into the other part of the purple litmus solution, and gas introduction is stopped and sealing is conducted after the purple litmus solution becomes a red solution; d, injecting a litmus solution, namely fully injecting a directly sealed purple litmus solution into one of the experimental containers in which the algae are put; filling the other two marked experiment containers with a red solution; and e, illumination: placing the three marked experiment containers under a fluorescent lamp for illumination. The method provided by the invention has the characteristics of simpleexperimental device and steps, less reagent use, good air tightness, obvious experimental phenomenon, environmental protection and good safety.

Description

technical field [0001] The invention relates to a teaching experiment of biology courses, in particular to a teaching experiment method of plant photosynthesis. Background technique [0002] Biology is a natural science based on experiments, so exploratory experiments play an important role in biology teaching. Biological experiment is an important method of biological science research and the basis of biological science development; biological experiment is also the best form to cultivate students' innovative consciousness, and it is an irreplaceable way to promote the comprehensive development of students' comprehensive quality. Experiments can help students build knowledge, deepen their understanding and mastery of problems, stimulate students' passion for learning, and improve their scientific literacy. [0003] The inventor has long been engaged in the teaching and research of biology education in middle schools and found that "Is carbon dioxide an essential raw materi...

AI Technical Summary

Problems solved by technology

[0004] ① The experimental device is complicated and there are many reagents

[0005] ②Complicated experimental steps and long experimental time

Sodium hydroxide and alcohol lamps are used in the experiment process, which has potential safety hazards, and the operation needs to be very cautious. In addition, the complex processes such as assembly, decolorization, and rinsing of the sealing device require the guidance of the teacher throughout the process, which brings great difficulties to the students' learning and the teacher's teaching. There is a certain degree of difficulty; the dark treatment takes a day and night or 2-3 days, the light time is 2-4 hours, and the alcohol decolorization takes about 10 minutes. The whole experiment takes a long time, which is not conducive to the teaching of teachers, and takes up a lot of learning time for students, which is not conducive to the junior high school stage. Students who have many subjects to study

[0006] ③ The airtightness of the experiment is not good (see figure 1 )

In addition, if the decolorization of the pigment is not complete, there may be interference from chlorophyll, resulting in inconspicuous experimental phenomena

[0008] ⑤wasting resources and polluting the environment

The leaves of geranium used in the material will die after being heated, which loses its experimental value and cannot be recycled; a large amount of alcohol and sodium hydroxide are used in the experiment, resulting in waste of resources and environmental pollution

[0009] ⑥Experimental materials are not easy to obtain

Geraniums are mostly maintained indoors, and they will wilt quickly when moved to strong light. The growth is relatively slow, the number is limited, and the petioles are fragile and easy to fall off. It is difficult to meet the needs of group experiments.

[0010] In addition, the above-mentioned biological experiments have high requirements for experimental equipment, experimental sites and other experimental facilities, and some schools still cannot meet the requirements for carrying out the above-mentioned experiments, which is not conducive to the popularization of experimental teaching

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