Animals possess nerve networks or nervous systems to respond to their environment. But
the single celled Amoeba does not possesses any nerve cell, so, how it come to know
whether a particle it encounters is a grain of sand and not its dinner?

(1) By chemotaxis

(2) By skin

(3) By hormones

(4) All of these

Subtopic:  Nervous System |
 55%
AIIMS - 2009
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Assertion   :       Circular smooth muscles of iris contract when bright light falls on the eye.

Reason      :       Pupil gets constricted by the contraction of circular smooth muscles of iris.

  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
Subtopic:  Extra Ocular Muscles & Optic Nerve (OLD NCERT) |
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Assertion :      Tongue is a gustatoreceptor.

Reason    :       Receptors for gustatory sensations are located in the taste bund.

  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
Subtopic:  Smell & Taste (OLD NCERT) |
 73%
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Assertion    :       All of the cranial nerves are said to be mixed nerves.

Reason      :       All cranial nerves carry both sensory and motor nerve fibres simultaneously.

  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
 56%
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Assertion   :       The chemical stored in the synaptic vesicles are termed as neurotransmitters.

Reason      :       Synaptic vesicles release these chemicals in the synaptic cleft.

  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
Subtopic:  Synapse |
 70%
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Assertion    :       Nerve impulse can never be transmitted from dendrite or cell body of one neuron to the axon of the next neuron, across a synapse.

Reason      :       This happens because of the synaptic delay at each synapse.

  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
Subtopic:  Nervous System |
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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
Subtopic:  Nervous System |
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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.

  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
 66%
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Assertion   :       Cerebrospinal fluid is present throughout the central nervous system.

Reason      :       CSF has no such function.

  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
Subtopic:  Meninges, Ventricles & CSF |
 68%
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Assertion  :       A person has lost most of its intelligence, memory and judgement.

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

  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
Subtopic:  Cerebrum, EEG & Sleep |
 68%
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