Protonema occurs in the life cycle of

Explanation

Protonema occurs in the life cycle of Funaria.The protonema is a juvenile stage of the gametophyte in the life cycle of mosses. It is a filamentous structure that develops from the germinating spore. The protonema can grow and branch extensively, and it eventually gives rise to leafy gametophore shoots.Riccia, Anthoceros, and Spirogyra are all bryophytes, but they do not have a protonema stage in their life cycles. Riccia is a thalloid liverwort, meaning that its gametophyte is a flat, sheet-like structure. Anthoceros is a hornwort, meaning that its sporophyte is horn-shaped. Spirogyra is a green alga, and it does not have a gametophyte-sporophyte alternation of generations. Funaria is the correct answer.