字典翻译 问答 小学 英语 Everyonehasseenplantsgrowingbuthaveyoueverthought61.theygettheirfood?Intheseventeenthcentury62EuropeanscientistcalledVanHelmotaskedthisquestion.Likemostpeoplehethoughtplantsgettheirfoodfroms
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Everyonehasseenplantsgrowingbuthaveyoueverthought61.theygettheirfood?Intheseventeenthcentury62EuropeanscientistcalledVanHelmotaskedthisquestion.Likemostpeoplehethoughtplantsgettheirfoodfroms
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Everyonehasseenplantsgrowingbuthaveyoueverthought61. theygettheirfood?Intheseventeenthcentury62 EuropeanscientistcalledVanHelmotaskedthisquestion.Likemostpeoplehethoughtplantsgettheirfoodfromsoil.Howeverhedecidedtotestthetheorywith63 (experiment).

Firsthedriedsomesoilputitintoapotandweighedit.Nextheweighedasmalltreeplantedininthepotandaddedrainwater.Thenhewateredit64 (regular)withrainwater.

Afterfiveyearsheremovedthetreefromthepotandweigheditagain.Hefoundthatthetreehadgainedahugeamountofweight.Whenheweighedthesoil65 itwasalmostexactlythesameasithadbeenfiveyearsago.Sohedrewtheconclusionthatthetreegrewbydrinkingwater.Thoughitturned66 tobewrongheshowedtheimportanceoftheuseof67 (science)evidencetosupportideas.

Wenowknowthatplantsandtreesmaketheir68 food.Theirleaveswhen69 (expose)totheairandsunarelikefactorieswhichcanchangetheenergyfromthesunintochemicalenergy.Duringthisprocessoxygenandsugar70 (produce).Theoxygenisreleasedbackintotheairandthesugarisusedbytheplantasfood.

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  61
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