Assertion   :       The brain stem contains centres for controlling activities.

Reason      :       Brain stem is very sensitive.

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   :       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.

Assertion   :       Transmission of the nerve impulse across a synapse is accomplished by neurotransmitters.

Reason      :       Transmission across a synapse usually requires neurotransmitters because there is small space i.e. synaptic cleft, that separates one neuron from another.

Assertion   :       Rabies is acute infectious disease of warm blooded mammals characterized by involvement of central nervous system resulting in paralysis and finally death.

Reason      :       This is caused due to neuotropic filterable bacteria in saliva of rabid animals.

Assertion  :  The imbalance in concentration of Na+, K+ and proteins generates resting potential.

Reason      :  To maintain the unequal distribution of Na+ & k+, the neurons use electrical energy.

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

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

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

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