Which of the following statements is correct regarding sexual reproduction in basidiomycetes?
a. Plasmogamy occurs by the fusion of two somatic cells of different strains.
b. Karyogamy and meiosis occur in the basidium producing four basidiospores.
c. Basidiospores are exogenously produced on the basidium.

In basidiomycetes, plasmogamy is brought about by fusion of two vegetative or somatic cells of different strains or genotypes of monokaryotic hyphae. The resultant structure is dikaryotic which ultimately gives rise to basidium. Karyogamy and meiosis take place in the basidium producing four basidiospores. The basidiospores are exogenously produced on the basidium.