Question

21. You are investigating the possibility that caribou use a compass sense in ing from the Canadian forests north to the tundra. If you time-shift car W e a compass sense in their spring migration W north to the tundra. If you time-shift caribou six hours, so that they think that the noonday sun is the early morning sun, they travel east rather than nonu Sun, they travel east rather than north. However, on cloudy uays they correctly move north whether time-shifted or not. What does this evidence the presence of a compass sense or senses? How could you be sure? (10)

Answer 1

The light signal is one of the important sensory signals for the movement. Apart from this wind may act as a sensory signal, wind direction may help for the movement, in the case where sunlight is not available like on cloudy days. Temperature may be another parameter