Yellowing of tea leaves occurs due to the deficiency of:

Deficiency symptoms of an element tend to appear first in young leaves. It indicates that the element is relatively immobile. Which one of the following elemental deficiencies would show such symptoms?

'Petiole crack' is caused by the deficiency of

Match the deficiency symptoms given in Column $I$ with elements given in Column $II$.

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

Choose the correct option-

Deficiency of molybdenum causes:

Chlorosis is caused due to the deficiency of: