In which of the following fishes does intestine act as an accessory respiratory organ?

Correct option is C

Correct Answer: (c) Loaches
Explanation:
→ Loaches (family Cobitidae) use their intestine for air-breathing; swallowed air passes through the gut where gas exchange occurs.
→ Adaptation for survival in stagnant or oxygen-poor waters.
→ Air is expelled through the anus after gas exchange.
Information Booster:
→ Similar adaptations seen in some catfishes but not as specialized.
→ Loaches exhibit burrowing behavior aiding respiration.
→ Intestinal respiration is rare among fishes.
Additional Information (Other Options):
(a), (b), (d) – may show accessory breathing but not intestinal-based.