NEETZoologyStructural Organisation in Animals
Which of the following statements regarding the nervous system of a frog is incorrect?
Options
- AThe peripheral nervous system consists of cranial and spinal nerves.
- BTwelve pairs of cranial nerves arise from the brain.
- CThe autonomic nervous system consists of sympathetic and parasympathetic chains.
- DThe medulla oblongata passes out through the foramen magnum and continues into the spinal cord.
Correct answer
B. Twelve pairs of cranial nerves arise from the brain.
Step-by-step solution
In frogs, exactly 10 pairs of cranial nerves arise from the brain, not 12 pairs. Humans and other mammals have 12 pairs of cranial nerves, which is a common point of confusion. The other statements are factually correct according to NCERT: the peripheral nervous system is indeed made up of cranial and spinal nerves; the autonomic nervous system consists of sympathetic and parasympathetic chains; and the medulla oblongata exits the skull through the foramen magnum to continue as the spinal cord. Answer: Twelve pairs