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(B) $\Rightarrow$ Xylem sap (exudate) is a mixture of water,minerals,and some organic compounds. By performing a chemical analysis of this exudate,we

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It reveals the chemical form of minerals being transported.

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(B) $\Rightarrow$ Xylem sap (exudate) is a mixture of water,minerals,and some organic compounds. By performing a chemical analysis of this exudate,we can determine the specific chemical forms in which minerals are transported from the roots to the rest of the plant. For example,nitrogen is primarily absorbed from the soil as $NO_2^-$ and $NO_3^-$ ions and is transported in these forms or as organic nitrogen (amino acids/amides). Similarly,sulfur is absorbed as sulfate ions $(SO_4^{2-})$ and is transported in the same form. Thus,analyzing the exudate provides direct evidence of the mobile forms of mineral nutrients.

	Remobilized	Not Remobilized
$A$	$P, S, N, K$	$Ca$
$B$	$Ca$	$P, S, N, K$
$C$	$P, S, Ca, K$	$N$
$D$	$N$	$P, S, Ca, K$

If one wants to find minerals and the form in which they are mobilized in the plant,how will an analysis of the xylem exudate help?

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$C$ $P, S, Ca, K$ $N$
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