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← Nature & AnimalsWhich mechanism enables salmon to return accurately upriver, even facing strong currents?
A)Olfactory imprinting paired with map-like memory✓
B)Celestial navigation and polarised light sensors
C)Electroreceptors detecting faint muscle impulses
D)Echolocation along riverbank topography
💡 Explanation
Salmon depend on olfactory imprinting; young salmon memorize the scent of their natal river, then create an 'olfactory map'. This allows them to navigate back, because they follow familiar scents rather than using other navigational senses.
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