Question

Accessory respiratory organs are associated with
A. Anabes
B. Ophiocephalus
C. Clarias
D. All of the above

Answer 1

Hint: Accessory respiratory organs provide various advantages to the animals. These organs help them to survive even in unfavorable conditions. Absorption of oxygen is the primary function of accessory respiratory organs. Fishes have special lining of blood vessels on their body which helps in their respiration. Anabes, Ophiocephalus and clarius belong to the category of fishes that have accessory glands.

Complete step by step answer:
Accessory respiratory organ includes a system of air chambers. These chambers are formed from the outgrowths of the mouth or gill region. It occurs in those fishes that occasionally leave the water. Dense network of blood vessels in the skin lining of the fishes helps in the exchange of gases. Fishes such as labyrinth fish, snakeheads, or air-breathing catfish can survive outside the water for some considerable time. The swim bladder in the fishes may also serve as an accessory respiratory organ. Accessory organs can be of different types: suprabranchial organ, branchial outgrowth, pharyngeal Diverticula, Pneumatic sacs, buccopharyngeal epithelium, integument, gut epithelium and swim-bladder. Accessory respiratory organs such as air bladder, buccal cavity, alimentary canal, skin air chambers help fishes to take in atmospheric oxygen. These organs also enable them to aestivate (summer sleep), to live in water having biological oxygen in depth and also to survive outside the water. Examples include Anabes, Amphipnous, Saccobranchus, Clarias, Lepidodiren and Ophiocephalus. From the above information we know that all of the above mentioned organs are accessory respiratory organs.

So, option D is the correct answer.

Note: The respiratory organ of the cockroaches is highly efficient in that they can hold their breath for up to seven minutes even if there is no lung present in their body. External valves are present in their body called spiracles. When they need to stop respiration they simply close the spiracles. Cockroaches have a high adaptation rate.