What is the deficiency effect of Molybdenum?

Grey spots on oats are caused by the deficiency of which element?

Match the mineral deficiency disorders given in Column $I$ with their symptoms given in Column $II$.

Column $I$ (Disorder)	Column $II$ (Description)
$i$. Chlorosis	$a$. Localised death of tissues in leaves
$ii$. Necrosis	$b$. Premature fall of flowers,fruits and leaves
$iii$. Mottling	$c$. Yellowing of leaves due to absence of chlorophyll
$iv$. Abscission	$d$. Appearance of green and non-green patches on leaves

Choose the correct option from below.

On the basis of symptoms of chlorosis in leaves,a student inferred that this was due to the deficiency of nitrogen. This inference could be correct only if yellowing of leaves appeared first in

Browning of cauliflower takes place due to deficiency of which one of the following elements?

'Khaira disease of rice' is due to