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| Do Plants Sleep?(高一适用) | |
| 作者姓名： | 刘洪毓 |
| 作者单位： | 上海 |
| 摘 要： | Someplantsdosleep,buttheirkindofsleepisnotlikeoursandithappensforadifferentreason.Manyflow-ers,suchasthewaterlily(水仙)andthedaisy(雏菊花),openduringthedayandcloseatnight.Others,suchastheeveningprimrose(樱草花)andsomespeciesofthetobaccoplantscloseinthedayandopenatnight.Thischangeinpositionfromdaytimetonighttimeiscalled“sleepmovement”.Plantsdonot“know”whennighthascome.Theysimplyrespondtothechangeinlightorthechangeintemperature.Tem-peraturestendtofallatnight.Whydoplants“sleep”?Somescient… |
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