photoperiodism

例句：

1. 1.Photoperiodism is the study of howlight affects plant growth and development.
   光周期主义是研究光如何影响植物生长和发育的学科。
2. 2. The research in photoperiodism has led to new insights intothe relationship between plants and their environment.
   光周期研究已经揭示了植物与其环境之间关系的新见解。
3. 3. In this experiment, wetested the hypothesis that different light conditions affectthe growth rate of seedlings.
   在这个实验中，我们测试了不同光照条件对幼苗生长速率的影响这一假设。