Which of the following pair of plant disease - microorganism is correct?

I. Citrus canker - Virus

II. Rust of wheat - Fungi

Only II

The correct answer is Option (1)- Only II

The correct pair of plant disease and microorganism is: II. Rust of wheat - Fungi

Rust of wheat is indeed caused by a species of fungi Puccinia triticina. belonging to the order Pucciniales. These fungi infect wheat plants and cause characteristic reddish-brown lesions or pustules on the leaves, stems, and other parts of the plant.

On the other hand, Citrus canker is caused by the bacterium Xanthomonas citri. It infects citrus plants, leading to the formation of raised, corky lesions on leaves, stems, and fruits. Therefore, the pairing of Citrus canker with a virus is incorrect.