In ferns, the sex organs are produced on
Prothallus
The correct option is D.
Explanation of the correct option:
Explanation of the incorrect options:
Option A:
Protonema is a branched, green, and filamentous stage of the gametophytic stage in mosses.
Option B:
Sporophyll is the leaf that is responsible for bearing the sporangia.
Option C:
Sporangium is the structure that is responsible for storing the spores.
Final answer: In ferns, the sex organs are produced on the prothallus.