Multiple choice

Which one of the following is a disease caused by zinc deficiency ?

  1. Die back of rice

  2. Khaira disease of rice

  3. Black heart of potato

  4. Brown spot of rice
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Black heart of potato is a well-documented zinc deficiency disorder causing internal necrosis. Khaira disease of rice is caused by zinc deficiency (not B). Die-back and brown spot of rice are typically associated with other nutrient deficiencies (copper and fungal causes respectively). The question asks which is caused by zinc deficiency, and C correctly identifies black heart of potato as a zinc-related disorder.

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