Question

According to the passage, which of the following is a characteristic that distinguishes electroreceptors from tactile receptors?

• A. The manner in which electroreceptors respond to electrical stimuli
• B. The tendency of electroreceptors to be found in clusters
• C. The unusual locations in which electroreceptors are found in most species.
• D. The amount of electrical stimulation required to excite electroreceptors

Answer 1

The correct option is D The amount of electrical stimulation required to excite electroreceptors

The best answer is D. According to the passage, the electrorecepors in the snouts of spiny anteaters responds to extremely weak electrical fields. The author of the passage contrasts these electroreceptors with tactile receptors, stating that it takes field strengths “about 1,000 times greater than those known to excite electroreceptors” to excite the tactile receptors on an anteater’s snout. The passage does not contrast the two types of receptors with regard to the characteristics mentioned in choices A, B and C.