Which term describes the ability to sense Earth's magnetic field for navigation?

Which term describes the ability to sense Earth's magnetic field for navigation?

• A. Olfactory navigation
• B. Zugunruhe
• C. Magnetoreception
• D. Cryptochromes

Answer: (C)

Magnetoreception is the ability to sense Earth's magnetic field for navigation. This sense helps animals, especially migratory birds, orient themselves and navigate across long distances by interpreting the direction and sometimes the intensity of magnetic field lines. The mechanism behind it is thought to involve two systems: magnetite-based receptors that may detect field direction, and a light-dependent radical-pair process in proteins called cryptochromes that converts magnetic information into neural signals. The other terms describe different ideas: olfactory navigation uses smells to guide movement, not magnetic fields; zugunruhe is migratory restlessness, the behavioral urge to migrate rather than a sensory sense; cryptochromes are specific proteins implicated in the magnetic sense, not the overall ability itself.

Magnetoreception is the ability to sense Earth's magnetic field for navigation. This sense helps animals, especially migratory birds, orient themselves and navigate across long distances by interpreting the direction and sometimes the intensity of magnetic field lines. The mechanism behind it is thought to involve two systems: magnetite-based receptors that may detect field direction, and a light-dependent radical-pair process in proteins called cryptochromes that converts magnetic information into neural signals. The other terms describe different ideas: olfactory navigation uses smells to guide movement, not magnetic fields; zugunruhe is migratory restlessness, the behavioral urge to migrate rather than a sensory sense; cryptochromes are specific proteins implicated in the magnetic sense, not the overall ability itself.