In potatoes, black heart is caused by:

Correct option is C

✅ (c) lack of O₂ in storage: • Black heart in potatoes is a physiological disorder caused by oxygen deficiency. • Occurs in poorly ventilated storage areas where O₂ levels drop and CO₂ builds up. • Tissue in the center of the tuber turns black due to asphyxiation and cell death.
❌ (a) lack of CO₂ in storage: • Not the cause; it's oxygen that is essential.
❌ (b) lack of light in storage: • Leads to greening and solanine production, not black heart.
❌ (d) deficiency of Boron: • Affects cell wall formation and fruit integrity, unrelated to this issue.