Question

Which of the following causes leaf rust of wheat?

• A. A bacterium
• B. A fungus
• C. A virus
• D. A protozoan

Answer 1

Answer: (B)

A fungus

Leaf rust of wheat is a fungal disease. Rust fungi are plant pathogens. They affect the stem, leaves, and grains of wheat, barley, and rye. On getting infected, dusty, reddish-orange, or reddish-brown lesions appear on the surface of leaves and stem, giving a rust-like appearance.

So, the correct answer is option B.