Correct Answer - A
(a) Fungal disease, loose smut of whet spreads by seed and flowers. The causal organism of this disease is Ustilago fungus. It is an internal parasite. It has a dikaryotic mycelium which remains within the intercellular spaces of the host tissue. This fungus infects the ovary of the host flower as a result of which the masses of teliospores or brand spores are formed in place of grains, Teliospores are not surrounded by any wall hence, called loose smut.
