Considering that sounds and odors both trigger changes in the patterns of action potentials in sensory neurons, how does the brain perceive which sense is which when the action potentials reach the brain?
a. The action potentials stimulated by sounds are different in size and shape from those stimulated by odors.
b. The axons from different sensory neurons go to different areas of the brain.
c. Mechanoreception is not consciously perceived by the brain, whereas chemoreception is.
d. Chemoreception is not consciously perceived by the brain, whereas mechanoreception is.

Which of these statements about taste is true?

a. Sweetness is a measure of the concentration of hydrogen ions in food.

b. Sodium ions from foods can directly depolarize certain taste cells.

c. All bitter-tasting compounds have a similar chemical structure.

d. Sourness is detected when hydrogen ions bind to membrane receptors.

Give three examples of how the sensory abilities of an animal correlate with its habitat or method of finding food and mates.

Scientists generally think that a 'good hypothesis' is one that is reasonable and testable and inspires further research into a phenomenon. Using these criteria, explain whether Dalton's hypothesis about color vision was a good hypothesis. Was it correct?

What type of sensory system do migrating birds use to detect direction?

Compare and contrast the lateral line system of fishes with electroreception in sharks.

Evaluate the following statements according to the information presented in this chapter. Select True or False for each statement.

T/F Most human eyes have one type of rod and three types of cones.

T/F Rods are more sensitive to dim light than cones are.

T/F Nocturnal animals have fewer rods than diurnal animals.

T/F Both rods and cones use retinal and opsins to detect light.