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		<property:Deepen rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Ainsi, l’arbre est un être vivant tout comme nous, et pour se nourrir, il le fait grâce à ses racines.

Celles-ci possèdent d’innombrables petits poils appelés poils absorbants. Ainsi une plus grande surface est en contact avec l’eau du sol, ce qui facilite les échanges.

Toutes ces racines lui permettent plusieurs fonctions:

*Elles absorbent l’eau et les substances nutritives contenues dans le sol, pour constituer la sève brute, le “sang” vital de l’arbre
*Elle stockent des ressources énergétiques pendant la saison hivernale, cela permet la survie au ralenti de l’arbre
*Elle lui assurent un ancrage solide dans le sol, pour lui permettre de résister aux intempéries

Elles sont enfin le siège d’association avec d’autres organismes vivants présents dans le sol(champignons, bactéries), ce genre d'association est appelée une symbiose et n'est pas indispensable à la vie de l'arbre mais lui offre des opportunité de mieux se nourrir.&lt;br/&gt;</property:Deepen>
		<property:Description rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Nous allons découvrir de quoi se nourrit un arbre.</property:Description>
		<property:Difficulty rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Easy</property:Difficulty>
		<property:Disciplines_scientifiques rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Earth Sciences</property:Disciplines_scientifiques>
		<property:Disciplines_scientifiques rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Life Sciences</property:Disciplines_scientifiques>
		<property:Disciplines_scientifiques rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Matter Sciences</property:Disciplines_scientifiques>
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		<property:Explanations rdf:datatype="http://www.w3.org/2001/XMLSchema#string">L’eau est transportée par capillarité via l’essuie-tout, l’analogie avec les arbres est évidente.

Ceux-ci utilisent la capillarité pour puiser dans le sol les sels minéraux indispensables à leur survie.</property:Explanations>
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		<property:Licences rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Attribution (CC-BY)</property:Licences>
		<property:Main_Picture rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Group-La_diversit_des_arbres_fall-1051300_1920.jpg</property:Main_Picture>
		<property:Objectives rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Comprendre comment un arbre se nourrit-il!</property:Objectives>
		<property:Observations rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Au bout de quelques minutes nous observons que l’eau commence à arriver dans les récipients vides. Si tu goûtes l’eau, elle sera salée.</property:Observations>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string">L’un avec de la terre, du sel et de l’eau


L'autre avec seulement de l’eau et du sel.

&lt;br/&gt;</property:Step_Content>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Relier chacun des récipients à un récipient vide pour les relier nous utiliserons un morceau de papier essuie-tout.</property:Step_Content>
		<property:Step_Content rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Deux questions se posent alors :

→ Est-ce que l’eau va passer d’un récipient à l’autre?

→ Si l’eau se transfère, est-ce qu’elle sera salée?</property:Step_Content>
		<property:Step_Title rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Remplir deux récipients</property:Step_Title>
		<property:Step_Title rdf:datatype="http://www.w3.org/2001/XMLSchema#string">Relier les récipients</property:Step_Title>
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