Experimental method for preparing organic matters from green leaves under light

Abstract

The invention discloses an experimental method for preparing organic matters from green leaves under light, wherein the experimental method comprises the steps: selecting two pots of Chinese cabbage buds, respectively numbering the two pots of Chinese cabbage buds as a pot A and a pot B, covering the two pots of Chinese cabbage buds with lightproof boxes for dark treatment, taking off the box fromthe pot A, culturing in normal sunlight, and continuously covering the pot B with the box for shading culture; putting the leaves of the two pots of Chinese cabbage buds into two beakers respectively, adding alcohol with the concentration of 95% into each beaker, and then heating in a water bath until the leaves turn into transparent color from green; taking out the transparent Chinese cabbage bud leaves, putting the leaves into a beaker containing clear water, stirring the leaves with a glass rod attached to the leaves for 2-3 times, taking out the leaves, putting the leaves into a clean culture dish for dyeing, and dropwise adding an iodine solution into the leaves for dyeing; observing the change of the leaves of the Chinese cabbage buds after the iodine solution is dropwise added, andrecording experimental results. The method has the characteristics that experimental materials are easy to obtain and culture, the experimental cost can be saved, the experimental process is simple to operate, and the experimental effect is obvious.

Description

technical field [0001] The invention relates to a biology teaching experiment method, in particular to an experiment method for green leaves to produce organic matter under light. Background technique [0002] Biology is a subject that combines theory and practice. The important way for students to learn biology is observation and experiment. Through observation and experimentation, students' scientific literacy can be rapidly improved and developed. Therefore, the important carrier of biology teaching is biology experiment, which is an important way for students to obtain direct experience, can cultivate students' various abilities, and is also an important way for the implementation of quality education. [0003] The experiment "Green leaves make organic matter under light" is an exploratory experiment in the seventh grade volume 1 of junior high school biology published by the People's Education Edition. This experiment is representative and is a key experiment of biolo...

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Problems solved by technology

[0004] 1. In terms of material selection: the experimental material used in the textbook is geranium. First of all, the price of geranium is relatively high, which is likely to cause a waste of teaching resources. Secondly, it is difficult to obtain materials for geranium, especially in Guizhou. Geranium is rare, so Most schools only pass the teacher's explanation in the classroom for this experiment, and the students do not carry out the experiment operation, which is not good for the long-term development of the students

Moreover, in terms of experimental phenomena, the experimental phenomenon of geranium is not obvious, which is not conducive to the observation of students, and the effect required by the experiment cannot be achieved.

[0005] 2. In terms of operation: In terms of shading control in the textbook, black paper is used to cover the required shading parts, and then the blades are clamped with clips. Since the teaching objects are seventh-grade students, this kind of operation is very useful for them. It is difficult, and it is easy to cause damage to the blades, which will interfere with the experimental results to a certain extent.

[0006] 3. In terms of variable processing: the variable in this experiment is "light", so in terms of variable processing, it is related to the success of the experiment. In the textbook, only some leaves of the same geranium are shaded, and the starch produced by other leaves that are not shaded can be input. It is unreasonable to deal with experimental variables in this way, and it is easy to affect the experimental results

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