Every Book Back multiple-choice question from Nervous System (10th Standard Science, Samacheer Kalvi) — each with the correct option highlighted and a clear, worked explanation. Free to read in English and Tamil.
Q1
Bipolar neurons are found in
- A. retina of eyeCorrect
- B. cerebral cortex
- C. embryo
- D. respiratory epithelium
Explanation. Bipolar neurons possess two nerve processes extending from the cell body, acting as an axon and a dendron. These specialized sensory neurons are located in the retina of the eye and olfactory epithelium.
Q2
Site for processing of vision, hearing, memory, speech, intelligence and thought is
- A. kidney
- B. ear
- C. brainCorrect
- D. lungs
Explanation. The brain serves as the primary processing center of the central nervous system. It integrates sensory inputs like sight and hearing while controlling higher cognitive functions such as memory, speech, intelligence, and conscious reasoning.
Q3
In reflex action, the reflex arc is formed by
- A. brain, spinal cord, muscle
- B. receptor, muscle, spinal cord
- C. muscle, receptor, brain
- D. receptor, spinal cord, muscleCorrect
Explanation. A reflex arc represents the pathway traversed by nerve impulses during an automatic response. The stimulus is detected by a receptor, which sends signals to the spinal cord, which then commands an effector muscle to act.
Q4
Dendrites transmit impulse ______ cell body and axon transmit impulse ______ cell body.
- A. away from, away from
- B. towards, away fromCorrect
- C. towards, towards
- D. away from, towards
Explanation. Dendrites are branched projections that collect nerve signals and transmit impulses toward the neuronal cell body. Conversely, the axon is a single long projection that conducts nerve impulses away from the cell body toward target cells.
Q5
The outer most of the three cranial meninges is
- A. arachnoid membrane
- B. piamater
- C. duramaterCorrect
- D. myelin sheath
Explanation. The brain is enclosed and protected by three connective tissue layers termed meninges. Duramater is the outermost, thickest fibrous layer, followed by the middle web-like arachnoid membrane and the innermost vascular piamater.
Q6
There are ______ pairs of cranial nerves and ______ pairs of spinal nerves.
- A. 12, 31Correct
- B. 31, 12
- C. 12, 13
- D. 12, 21
Explanation. The human peripheral nervous system consists of nerves originating from the brain and spinal cord. Specifically, 12 pairs of cranial nerves emerge from the brain, while 31 pairs of spinal nerves branch off the spinal cord.
Q7
The neurons which carry impulses from the central nervous system to the muscle fibre.
- A. afferent neurons
- B. association neuron
- C. efferent neuronCorrect
- D. unipolar neuron
Explanation. Motor or efferent neurons conduct nerve signals away from the central nervous system toward effector organs, such as muscle fibers or glands, to elicit physical responses. Sensory or afferent neurons transmit signals in the opposite direction.
Q8
Which nervous band connects the two cerebral hemispheres of brain?
- A. thalamus
- B. hypothalamus
- C. corpus callosumCorrect
- D. pons
Explanation. The cerebrum is divided into left and right hemispheres by a median cleft. These two hemispheres are structurally and functionally linked across the center by a dense band of nerve fibers called the corpus callosum.
Q9
Node of Ranvier is found in
- A. muscles
- B. axonsCorrect
- C. dendrites
- D. cyton
Explanation. Nodes of Ranvier are periodic gaps or depressions along the insulating myelin sheath that coats an axon. These uninsulated regions facilitate the rapid, saltatory conduction of electrical nerve impulses down the nerve fiber.
Q10
Vomiting centre is located in
- A. medulla oblongataCorrect
- B. stomach
- C. cerebrum
- D. hypothalamus
Explanation. The medulla oblongata is the lowermost portion of the hindbrain connecting to the spinal cord. It houses autonomic reflex centers that regulate involuntary activities including heartbeat, respiration, blood pressure, salivation, and vomiting.
Q11
Nerve cells do not possess
- A. neurilemma
- B. sarcolemmaCorrect
- C. axon
- D. dendrites
Explanation. Sarcolemma is the specialized cell membrane surrounding muscle fibers, rather than nerve cells. Neurons feature a cell body along with dendrites, an axon, and a neurilemma covering myelinated axons.
Q12
A person who met with an accident lost control of body temperature, water balance, and hunger. Which of the following part of brain is supposed to be damaged?
- A. Medulla oblongata
- B. cerebrum
- C. pons
- D. hypothalamusCorrect
Explanation. The hypothalamus, located at the base of the thalamus, regulates essential involuntary homeostatic functions. Damage to this brain region impairs thermoregulation, thirst, appetite, and fluid balance control.
Frequently asked questions
How many MCQs are there in Nervous System?
This chapter has 12 book-back multiple-choice questions, each with the correct answer and a step-by-step explanation.
Are these 10th Standard Science MCQs free to practise online?
Yes. Every question, answer and explanation here is free, and you can also take them as a timed practice test.
Where can I find the Nervous System book-back answers?
The correct option for each question is highlighted on this page with a worked explanation, plus a quick answer-key summary at the top.
