Tikka disease is related with the crop:

Analyze the question: It asks which crop is affected by Tikka disease. This is a plant pathology question.

Explain the concept: Tikka disease is also called leaf spot disease of groundnut (peanut). It is caused by fungi of the genus Cercospora:

• Cercospora arachidicola (early leaf spot)
• Cercosporidium personatum (late leaf spot)

The symptoms are dark brown or black circular spots on the leaves, often with a yellow halo. Severe infection makes the leaves fall early and reduces the yield.

Step-by-step solution:

1. Recall the disease name: Tikka means "spot" (in Hindi), which fits a leaf-spot disease.
2. Match it to the crop: the leaf-spot disease called Tikka is specific to groundnut (Arachis hypogaea).
3. Check the other options: • Mustard is affected by white rust and Alternaria blight, not Tikka. • Paddy (rice) is affected by blast and brown spot, not Tikka. • All of the above is wrong, because Tikka is specific to groundnut.

Answer: The correct option is C. Groundnut.

Exam tip: Link the crop to its disease. Tikka goes with groundnut, blast with rice, and rust with wheat and cereals. Groundnut is widely grown in northern Nigeria, so this link is easy to remember. Also, whenever you see "All of the above", check each option carefully before choosing it.