Male reproductive organ found in guppies:

Correct option is C

Correct Answer: (c) Gonopodium
Explanation:
→ In male guppies and other Poeciliids, the anal fin is modified into a gonopodium used for internal fertilization.
→ Helps transfer sperm packets (spermatophores) to the female.
→ Characteristic of live-bearing fishes.
Information Booster:
→ Gonopodium shape is species-specific.
→ Plays a role in courtship and reproductive success.
→ Males show bright coloration for mate attraction.
Additional Information (Other Options): Pearl organ and tubercles occur in some other species as breeding structures.