11 . Which strategy is employed by grass plants to take up iron from soil?
(A)Transport of free ferrous ions (Fe2+, reduced form)
(B)Transport of free ferric ions (Fe3+, oxidized form)
(C) Secretion of chelators, called phytosiderophores, and uptake of ferric chelates
(D)Secretion of chelators, called phytosiderophores, and uptake of ferrous chelates
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