高中生物教材第二章“观察细胞质的流动”的分组实验中，用黑藻作为实验材料，必须事先把黑藻放在光下培养。观察细胞质流动时，其流动速度很缓慢，效果不明显。本人通过多次实践，选用紫罗兰的雄花丝作为观察材料，效果极佳。为确保实验效果明显，具体操作时应注意以下几点：a． In the group experiment of the second chapter of the High School Biology Textbook, “The observation of the flow of cytoplasm,” with the use of black algae as an experimental material, the black algae must be cultured in advance under the light. When observing cytoplasmic flow, the flow rate is very slow and the effect is not obvious. I have practiced many times and selected violet male filaments as observation materials with excellent results. In order to ensure obvious experimental results, the following points should be noted during specific operations: a.