Assertion   :       Nerve conduction is the one way conduction.

Reason      :       Nerve impulse is transmitted from dendrite terminals to axon terminals.

1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both the assertion and reason are false

Assertion    :       After hearing a sound, nerve impulse passes from neurons to the brain.

Reason      :       The neurons which pass nerve impulses from the body organ to the brain is called afferent neuron.

Assertion   :       Cerebrospinal fluid is present throughout the central nervous system.

Reason      :       CSF has no such function.

Assertion  :       A person has lost most of its intelligence, memory and judgement.

Reason     :       A person has operated a tumour located in the cerebrum.

Assertion   :       Some areas of the brain and spinal cord look white.

Reason      :       This is because cell bodies of neurons are situated in those areas.

Assertion   :       Motor neuron terminates on a motor end plate at the neuromuscular junction.

Reason      :       Motor end plate acts as receptor for detecting changes in the muscle fibres.

Assertion   :       The brain stem contains centres for controlling activities.

Reason      :       Brain stem is very sensitive.

Assertion   :       Spinal cord has a column of both grey and white matter.

Reason      :       Grey matter forms the central spinal canal.

Assertion   :       All motor neurons are efferent neurons.

Reason      :       Motor neurons conduct nerve impulses from the spinal cord to the brain.

Assertion  :      Medulla oblongata causes reflex actions like vomiting, coughing and sneezing.

Reason     :      It has many nerve cells which control autonomic reflexes.