植物具有向性运动,向性运动是植物体受到单一方向的外界刺激而引起的一种定向运动。对植物的向性运动,我们可以设计实验,观察和探究以下问题:①小麦幼苗在单侧光照射下的生长方向;②玉米根的生长方向与重力的关系(实验装置和材料物品自选)。1 实验设计要求实验事先并不知道实验结果,需要我们自己设计实验进行探究。在实验设计之前,应掌握所研究问题的性质,具备必要的理论知识和基本的实验技能和技术。实验 Plants have tropism, and tropism is an directional movement caused by external stimuli in a single direction. For the tropism of plants, we can design experiments to observe and explore the following issues: 1 the growth direction of wheat seedlings under unilateral light irradiation; 2 the relationship between the growth direction of corn roots and gravity (experimental devices and material items are optional). 1 The experimental design requires that the experiment does not know the experimental results in advance, and we need to design our own experiments for exploration. Prior to the experimental design, the nature of the research question should be mastered, with the necessary theoretical knowledge and basic experimental skills and techniques. experiment