Which of the following compounds provides the 6 electrons required by nitrite reductase to reduce NO₂⁻ to NH₄⁺ in higher plants?

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Ferredoxin is a small iron-sulfur protein that functions as a carrier of electrons in plant photosynthesis and cellular respiration. It is known to provide the six electrons required by nitrite reductase to reduce NO₂⁻ to NH₄⁺ in higher plants. Plastoquinone is an electron carrier in the photosynthetic electron transport chain, heme is not involved in nitrogen reduction, and CO₂ is not a source of electrons for nitrite reduction.

Which of the Following Compounds Provides the 6 Electrons Required