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Neural Control and Coordination in Animals MCQs for NEET — Zoology Questions with Answers

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Inner ear is

A. Air filled inner segment B. Made up of two parts: Bony and Membranous C. Membranous labyrinth encloses bony labyrinth D. Membranous labyrinth is surrounded by endolymph

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Explanation

NCERT page number 325

21.6.1 Ear

Neural Control And Coordination

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The impulses of sound waves are analysed and recognised in which area of brain?

A. Auditory medulla B. Auditory cortex C. Auditory fissure D. Auditory ridges

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Explanation

NCERT page number 327

21.6.2 Mechanism of Hearing

Neural Control And Coordination

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The impulses of sound wave are transmitted by …. In the auditory cortex of the brain.

A. Afferent Fibres via auditory nerves B. Efferent Fibres via auditory nerves C. Association fibres via auditory nerve D. Both A and C

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Explanation

NCERT page number 327

21.6.2 Mechanism of Hearing

Neural Control And Coordination

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Which of the following is true about neural system

A. It provides point to point rapid coordination among organs B. Coordination is fast and short lived C. Response is very quick in it D. All of the above

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Explanation

Refer NCERT, Para 1, Page 331

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The system which coordinate and regulate the physiological functions in the body is

A. Nervous System and Excretory system B. Endocrine System and Circulatory system C. Nervous System and Endocrine System D. Excretory and Circulatory system

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Explanation

Refer NCERT, Para 1, Page 331

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Which of the following statements is INCORRECT regarding chemical synapses?

A. Neurotransmitters are involved in impulse transmission. B. The pre- and post-synaptic membranes are separated by a synaptic cleft. C. Transmission of impulse is always faster than in electrical synapses. D. Synaptic vesicles fuse with the pre-synaptic membrane to release neurotransmitters.

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Explanation

At a chemical synapse, the membranes of the pre- and post-synaptic neurons are separated by a fluid-filled space called synaptic cleft. Chemicals called neurotransmitters are involved in the transmission of impulses at these synapses. Impulse transmission across an electrical synapse is always faster than that across a chemical synapse. Therefore, option o3 is incorrect.

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An axon terminal contains bulb-like structures called synaptic knobs, which possess synaptic vesicles. What do these vesicles primarily contain?

A. Na+ ions B. K+ ions C. Neurotransmitters D. Myelin sheath components

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Explanation

The axon is a long fibre, the distal end of which is branched. Each branch terminates as a bulb-like structure called synaptic knob which possess synaptic vesicles containing chemicals called neurotransmitters. These neurotransmitters are crucial for impulse transmission across a synapse.

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During synaptic transmission at a chemical synapse, what specific event triggers the movement of synaptic vesicles towards the pre-synaptic membrane?

A. High concentration of K+ ions in the axoplasm B. Arrival of an action potential at the axon terminal C. Repolarization of the post-synaptic membrane D. Reduced concentration of Na+ ions in the synaptic cleft

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Explanation

When an impulse (action potential) arrives at the axon terminal, it stimulates the movement of the synaptic vesicles towards the membrane where they fuse with the plasma membrane, releasing neurotransmitters into the synaptic cleft.

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Which type of synapse allows direct flow of electrical current from one neuron to another due to close proximity of their membranes?

A. Chemical synapse B. Neuromuscular junction C. Electrical synapse D. Sensory synapse

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Explanation

At electrical synapses, the membranes of pre- and post-synaptic neurons are in very close proximity. Electrical current can flow directly from one neuron into the other across these synapses.

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Which of the following is characteristic of impulse transmission across an electrical synapse?

A. It involves the release of neurotransmitters. B. It is generally slower than transmission across chemical synapses. C. It is very similar to impulse conduction along a single axon. D. It always involves a synaptic cleft filled with fluid.

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Explanation

Transmission of an impulse across electrical synapses is very similar to impulse conduction along a single axon. Electrical synapses are characterized by direct current flow and do not involve neurotransmitters or a significant synaptic cleft. Impulse transmission across an electrical synapse is always faster than that across a chemical synapse.

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