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Question

Die back disease in citrus is due to deficiency of

A
Mo
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B
B
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C
Cu
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D
Zn
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Solution

The correct option is A Cu
Copper is required in all plant parts. Copper forms a component of enzymes, such as phenolases and tyrosinase.
Copper being a constituent of plastocyanin plays a role in photophosphorylation. Copper maintains the carbohydrate-nitrogen balance.
Deficiency symptoms of copper are-
i. Causes die back of shoots especially in Citrus.
ii. A disease called as exanthema, causes the yield of gums on the bark.
iii. Reclamation disease is caused in plants growing on newly reclaimed soil, where seed formation is affected.

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