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2014年高考全国卷I生物29题,考查了课本的基础实验和基础知识,但考生的回答情况并不是特别理想。总括起来出错原因主要是基础知识不扎实、生物术语不准确、概念混淆。下面进行详细分析:一、原题再现及标准答案29.(9分)回答下列问题:(1)在观察大蒜根尖细胞有丝分裂的实验中,常用盐酸酒精混合液处理根尖,用龙胆紫溶液染色。实验中,盐酸酒精混合液的作用是
2014 National Volume I exam 29 questions, examining the basic textbook experiments and basic knowledge, but the candidates answer the situation is not particularly ideal. To sum up the main reason for the error is not solid basic knowledge, biological terminology is not accurate, the concept of confusion. The following detailed analysis: First, the original title reproduction and standard answer 29. (9 points) to answer the following questions: (1) In the observation of garlic root tip cell mitosis in the experiment, commonly used hydrochloric acid alcohol mixture to deal with the root tip with gentian violet Solution staining. In the experiment, the effect of hydrochloric acid alcohol mixture is