Mineral Nutrition Question 7

7. Best defined function of Manganese in green plants is:

[2012]

(a) Photolysis of water

(b) Calvin cycle

(c) Nitrogen fixation

(d) Water absorption

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Answer : a

Hints & Solution

(a) The best defined function of manganese is in the splitting of water to liberate oxygen during photosynthesis. It is absorbed in the form of manganese ions $(Mn^{2+})$. It activates many enzymes involved in photosynthesis, respiration and nitrogen metabolism.



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