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在初中《动物学》《蝗虫》一节的教学中,一般是采用溺水实验(将一只活蝗虫头部浸在盛水的烧杯中,另取一只从中胸及腹部浸在水中。二分钟后,看哪只溺死),证明蝗虫的气门是气体出入身体的门户,而不是从头部某部位进出气体的。然而,当气温降至10℃以下时,几乎冻僵的蝗虫在水中浸泡24小时后均未死亡。经分析认为,这可能是低温对蝗虫的影响所致。我们对蝗虫分别采用光照或温箱内加热办法,使蝗虫活动显著增加,再取出实验,约3-5分钟可出现结果。
In the teaching of Zoology and Locusts in the junior high school, a drowning test is generally used (one live locust head is immersed in a beaker of water and the other is immersed in the water from the mid-chest and abdomen.) Two minutes After watching which drowning), proof locust valve is the gateway to the body out of the body, rather than from a certain part of the head out of the gas. However, when the temperature dropped below 10 ° C, almost frozen locusts did not die after immersion in water for 24 hours. After analysis, this may be due to the impact of low temperature on locusts. We use locusts were light or warm-box heating methods, so that locust activity increased significantly, and then remove the experiment, about 3-5 minutes can be the result.