Final answer:
Ferns carry their spores on the back of their leaves, in structures called sori.
Step-by-step explanation:
Ferns are the plant type that carries its spores on the back of its leaves. The spores are contained in structures called sori, which are usually found on the undersides of the fern's fronds or leaves. Each sorus can contain hundreds to thousands of spores, which are released into the environment when the sorus ruptures.
Learn more about Plant reproduction