OnlineCBT
Biology · ANIMAL KINGDOM
हिन्दीObserve the cartilaginous fishes illustrated in Figure 4.19. Which combination of anatomical features correctly explains why these organisms must swim constantly without resting?
Correct answer · Option 3
Absence of an air bladder forces continuous swimming to prevent sinking
Explanation
Chondrichthyes (e.g., Scoliodon and Pristis shown in Fig 4.19) lack an air bladder (swim bladder); due to the absence of buoyancy regulation, they must swim constantly to avoid sinking.
