Which fungal division is characterized by producing only asexual spores?

The division characterized by producing only asexual spores is Deuteromycota, which is known for lacking a sexual reproductive stage in its life cycle. This group, often referred to as imperfect fungi, reproduces solely through asexual means, primarily by forming conidia (asexual spores). The absence of a known sexual reproductive phase distinguishes Deuteromycota from other fungal divisions, which typically have both sexual and asexual reproductive cycles.

Zygomycota, for example, is known for producing sexual spores, particularly zygospores, alongside its asexual spores. Chytridiomycota also has a mix of reproductive strategies, including both asexual and sexual reproduction. Ascomycota reproduces sexually through the formation of ascospores and can also produce asexual spores. Therefore, Deuteromycota stands out for its exclusive reliance on asexual reproduction, making it the correct answer.