The correct answer is option 2, bread mould. Bread mould is a type of fungus that reproduces by producing spores. Spores are small reproductive structures that are capable of developing into new organisms under favorable conditions. In the case of bread mould, the spores are produced in structures called sporangia, which are usually visible as thin, black threads on the surface of bread or other organic matter where the mould grows.

Options 1 (rose), 3 (potato), and 4 (ginger) are incorrect because they are not spore-producing plants. Roses reproduce through the formation of seeds, potatoes reproduce through the growth of tubers, and ginger reproduces through the growth of rhizomes.

Therefore, bread mould is the only option that fits the description of a spore-producing plant.