十万个为什么·科学启蒙30篇（2）

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植物是如何‘知道’春天到了该开花的？

Plants sense seasonal changes using light, temperature, and internal biological clocks.
Special proteins in leaves detect how long nights last each day—a process called photoperiodism.
Many spring-blooming plants need long nights followed by warming temperatures to start flowering.
Cold winter temperatures break seed dormancy and reset growth timing in some species.
Hormones like florigen travel from leaves to buds to trigger flower development.
Genes switch on and off in response to environmental cues, controlling blooming time precisely.
Urban heat islands sometimes cause city trees to bloom earlier than rural ones.
Pollinators like bees also rely on these timing signals to find food when flowers open.
Climate change is disrupting this balance, causing mismatches between blooms and pollinators.
Scientists study plant genes to breed crops that flower reliably under changing conditions.

听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。

Plants sense seasonal changes using light, temperature, and internal biological clocks. 植物通过光、温度和内部生物钟感知季节变化。
Hormones like florigen travel from leaves to buds to trigger flower development. 成花素等激素从叶片运输至芽点，触发花朵发育。
Climate change is disrupting this balance, causing mismatches between blooms and pollinators. 气候变化正扰乱这种平衡，导致开花期与传粉者活动期错配。

这篇中文题目最接近哪一句？植物是如何‘知道’春天到了该开花的？一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？植物通过光、温度和内部生物钟感知季节变化。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） How Do Plants 'Know' When It’s Time to Bloom in Spring? How to cook noodles A maths worksheet

Plants sense seasonal changes using light, temperature, and internal biological clocks.

Plants sense seasonal changes using light, temperature, and internal biological clocks.

第一版：录下来、回听、再听标准音。系统打分以后再加。

用今天的表达，自己说一句。

例子：Plants sense seasonal changes using light, temperature, and internal biological clocks.