A growth promoting rhizobacterium, which produces an iron chelating substance is

Rhizobium japonicum

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Azospirillium

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Pseudomonas putida

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Aspergillus

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Solution

The correct option is A Rhizobium japonicum
Rhizobium japonicum is a bacterial species. These bacteria form a symbiotic association with the leguminous plants by the formation of nodules. They help through nitrogen fixation. The other strain of this bacterium is known as Bradyrhizobium japonicum has the ability to form iron-chelating substances.

Therefore A is the correct option.

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