Whip tail of cauliflower is caused by deficiency of

Answer: Option A

The whip tail of cauliflower is caused by a deficiency of molybdenum.
In this condition, the leaf blades do not develop properly and become strap-like. The growing point is severely deformed and no marketable curd is formed. This condition in cauliflower results because of the deficiency of molybdenum which occurs in acidic soils below 4 - 5 pH.
It may be controlled by liming the soil which reduces the acidity and increases the soil pH up to 6.5. It may also be controlled by the application of 1 - 2 kg/ac of sodium or ammonium molybdate.