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A) What are deficiency diseases? B) Give examples of diseases in which excess of an element can cause a disease

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A) What are deficiency diseases?

B) Give examples of diseases in which excess of an element can cause a disease.

C) How is proximity to brick kilns responsible for mango necrosis or black tip?

D) What is Khaira disease of paddy? Who discovered this disease for the first time in India? What are its causes? Also, suggest the control measures.