Deficiency of molybdenum causes:

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(D) The deficiency of molybdenum $(Mo)$ leads to mottled chlorosis,which is characterized by the yellowing of leaves in patches. This is accompanied b

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Mottling and necrosis of leaves

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(D) The deficiency of molybdenum $(Mo)$ leads to mottled chlorosis,which is characterized by the yellowing of leaves in patches. This is accompanied by marginal necrosis (death of leaf tissue) and the infolding of leaves. In many plants,such as cauliflower,it causes the 'whiptail' disease,where the leaf lamina becomes narrow and twisted due to the failure of the leaf blade to develop properly.

Column $I$ (Disease/Symptom)	Column $II$ (Associated Mineral)
$A$. Chlorosis	$I$. Boron
$B$. Brown heart disease	$II$. Zinc
$C$. Die-back of shoots	$III$. Magnesium
$D$. Malformed leaves	$IV$. Copper

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