The deficiency of copper in plants causes which disease?

Correct option is A

· Correct answer: (a) Die-back disease
· Copper deficiency in plants can cause Die-back disease, which leads to the death of plant tips and branches. Copper is essential for various plant metabolic processes, including enzyme activation.
Other options:
· (b) Khaira disease: Caused by zinc deficiency, not copper.
· (c) Whiptail disease: Caused by molybdenum deficiency, not copper.
· (d) Early blight disease: Caused by a fungal infection, not related to copper deficiency.