Nervous System

Samacheer Book Back Questions And Answers For Science Standard 10 “Nervous System“

I. Choose the correct answer:
1. Bipolar neurons are found in
(a) retina of eye
(b) cerebral cortex
(c) embryo
(d) respiratory epithelium

2. Site for processing of vision, hearing, memory, speech, intelligence and thought is
(a) kidney
(b) ear
(c) brain
(d) lungs

3. 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, muscle

4. Dendrites transmit impulse _____ cell body and axon transmit impulse _____ cell body.
a) away from, away from
b) towards, away from
c) towards,towards
d) away from, towards

5. The outer most of the three cranial meninges is
(a) arachnoid membrane
(b) piamater
(c) duramater
(d) myelin sheath

6. There are _____ pairs of cranial nerves and _____ pairs of spinal nerves.
(a) 12, 31
(b) 31, 12
(c) 12, 13
(d) 12, 21

7. The neurons which carries impulse from the central nervous system to the muscle fibre.
(a) afferent neurons
(b) association neuron
(c) efferent neuron
(d) unipolar neuron

8. Which nervous band connects the two cerebral hemispheres of brain?
(a) thalamus
(b) hypothalamus
(c) corpus callosum
(d) pons

9. Node of Ranvier is found in
(a) muscles
(b) axons
(c) dendrites
(d) cyton

10. Vomiting centre is located in
(a) medulla oblongata
(b) stomach
(c) cerebrum
(d) hypothalamus

11. Nerve cells do not possess
(a) neurilemma
(b) sarcolemma
(c) axon
(d) dendrites

12. 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) hypothalamus

II. Fill in the blanks:
1. _____ is the longest cell in our body.
2. Impulses travels rapidly in _____ neurons.
3. A change in the environment that causes an animal to react is called _____.
4. _____ carries the impulse towards the cell body.
5. The two antagonistic component of autonomic nervous system are _____ and _____.
6. A neuron contains all cell organelles except _____.
7. _____ maintains the constant pressure inside the cranium.
8. _____ and _____ increases the surface area of cerebrum.
9. The part of human brain which acts as relay center is _____.

Answers:
1. Neuron
2. multipolar
3. stimulus
4. Dendrite
5. sympathetic nerves and para sympathetic nerves
6. centrioles
7. cerebro spinal fluid
8. sulci and gyri
9. thalamus

III. State whether true or false, if false write the correct statement:
1. Dendrons are the longest fibres that conducts impulses away from the cell body.
2. Sympathetic nervous system is a part of central nervous system.
3. Hypothalamus is the thermoregulatory centre of human body.
4. Cerebrum controls the voluntary actions of our body.
5. In the central nervous system myelinated fibres form the white matter.
6. All the nerves in the body are covered and protected by meninges.
7. Cerebrospinal fluid provides nutrition to brain.
8. Reflex arc allows the rapid response of the body to a stimulus.
9. Pons helps in regulating respiration.

Answers:
1. False (Dendrone are the longest fibres and they conduct impulses towards cell body)
2. False (Sympathetic nervous system is a part of autonomous nervous system)
3. True
4. False (Cerebellum controls the voluntary actions of our body)
5. True
6. False (The brain and spinal cord are covered and protected by meninges)
7. True
8. True
9. True

IV. Match the following:
1. Nissil’s granules     A. Forebrain
2. Hypothalamus        B. Peripheral Nervous system
3. Cerebellum             C. Cyton
4. Schwann cell           D. Hindbrain

Answers:
1. C
2. A
3. D
4. B

V. Understand the assertion statement. Justify the reason given and choose the correct choice
1. Assertion: Cerebrospinal fluid is present throughout the central nervous system.
Reason: Cerebrospinal fluid has no such functions.
a. Assertion is correct and reason is wrong
b. Reason is correct and the assertion is wrong
c. Both assertion and reason are correct
d. Both assertion and reason are wrong

2. Assertion: Corpus callosum is present in space between the duramater and piamater.
Reason: It serves to maintain the constant intracranial pressure.
a. Assertion is correct and reason is wrong
b. Reason is correct and the assertion is wrong
c. Both assertion and reason are correct
d. Both assertion and reason are wrong

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