Teaching experiment method for exploring influence of inorganic salt on plant growth

Abstract

The invention discloses a teaching experiment method for exploring the influence of inorganic salt on plant growth. The method comprises the following steps: a, culturing wheat seedlings, specifically, placing a towel into a basin, spraying tap water onto the towel, sowing a plurality of full wheat seeds of the same variety onto the towel, and germinating the wheat seeds in a dark environment at the temperature of 10+ / -1 DEG C for 2 weeks in a shading manner to obtain the wheat seedlings; b, manufacturing a culture basin, specifically, taking three containers of the same specification, pouringSprite, tap water and soil leachate which have the same volume into the containers respectively, and making corresponding marks to obtain the culture basin; c, transplanting the wheat seedlings intothe culture basin, specifically, c1, selecting 9 wheat seedlings with the generally same growth condition, dividing the wheat seedlings into three groups, and measuring the maximum plant height and the maximum root length of each group of wheat seedlings respectively; recording after culturing for 2 weeks; and comparing the final recording result with the result before culturing. The method has the characteristics of readily available raw materials, simple experiment equipment, high safety and strong persuasion of experiment results.

Description

technical field [0001] The invention relates to a teaching experiment of biology courses, in particular to a teaching experiment method for exploring the influence of inorganic salts on plant growth. 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 been engaged in the teaching and research of biology education in middle schools for a long time and fou...

AI Technical Summary

Problems solved by technology

[0004] ① Experimental materials are not suitable

After watching the teacher's demonstration, these instruments are not easily available for students to explore after class

[0006] ③Experimental reagents are highly toxic

In the original experiment, 0.1% mercuric chloride solution was used for disinfection before cultivating wheat seedlings, rinsed with distilled water for more than three times, and then soaked in distilled water at 10°C for 12 hours before sowing. The 0.1% mercuric chloride used in this process The solution is a laboratory-specific disinfectant with strong disinfection ability, high irritation and corrosion, and high toxicity. It has a corrosive effect on metal utensils and is highly toxic to humans and animals. It is not easy to obtain in the market.

[0007] ④ The experimental results are not scientific

The original experiment only had distilled water as a control group, and the experimental results were not convincing and lacked scientific

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