Desert ants rely on which cue alongside sunlight to find their nest?

Desert ants rely on which cue alongside sunlight to find their nest?

• A. Magnetic fields
• B. Polarized light
• C. Star patterns
• D. Ocean swells

Answer: (B)

Desert ants navigate by using the sun as a compass and reading the polarized light in the sky as a directional cue. They detect the pattern of polarized light produced by sunlight scattering in the atmosphere, which stays predictable even when the sun isn’t visible. By comparing the angle of polarization to the sun’s direction, they can determine which way is home and keep a straight route back to their nest, especially after foraging. The other ideas don’t fit this specific navigation strategy: magnetic fields are not the primary cue these ants rely on in daylight, star patterns are used by some nocturnal species but not in this desert context, and ocean swells are irrelevant to land ants.

Desert ants navigate by using the sun as a compass and reading the polarized light in the sky as a directional cue. They detect the pattern of polarized light produced by sunlight scattering in the atmosphere, which stays predictable even when the sun isn’t visible. By comparing the angle of polarization to the sun’s direction, they can determine which way is home and keep a straight route back to their nest, especially after foraging. The other ideas don’t fit this specific navigation strategy: magnetic fields are not the primary cue these ants rely on in daylight, star patterns are used by some nocturnal species but not in this desert context, and ocean swells are irrelevant to land ants.