Q.22
The deficiency of which nutrient cause cavity spot of carrot?
EXPLANATION
Root Crops: Radish, Carrot, Beetroot and Turnip
- Cavity Spot in Carrot (Daucus carota):
- major physiological and pathological disorder characterized by sunken, elliptical, horizontal lesions on the carrot taproot that rapidly turn into dark cavities.
- Etiology: Primarily induced by localized deficiency of Calcium ($Ca$) in the rapidly expanding root cortex. Calcium deficiency disrupts cell wall pectate integrity and membrane permeability, predisposing tissue to secondary infection by Pythium species (Pythium violae, Pythium sulcatum).
- Other Elements: Boron deficiency causes root cracking/black heart; molybdenum causes whiptail in brassicas; zinc causes little leaf.
- Correct Option: Option 2 (Ca).
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