FRANK Solutions for Class 10 Biology Chapter 9 - Nervous System

Practise Frank Solutions for ICSE Class 10 Biology Chapter 9 Nervous System to prepare well for your ICSE board exam. Understand terms such as a neuroglial cell, cranial nerve, hormonal system, hypermetropia etc. with our Biology solutions. Learn the labelling of diagrams that explain the longitudinal section of the human brain, the vertical section of the mammalian brain, the structure of the human ear and the vertical section of the human eye.

Also, revise the various parts of the nervous system with our Biology learning materials like practice tests, concept videos, solved question papers etc. TopperLearning’s ICSE Class 10 Biology revision materials are created by experienced teachers according to the latest ICSE Class 10 Biology syllabus and exam guidelines. You can use these resources to prepare for the board examination and to secure top marks in Biology.

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Chapter 9 - Nervous System Exercise 115

Solution 1
(i) Central Nervous System
(ii) Autonomic Nervous System
(iii) Conus medullaris / Medullary cone
(iv) Mixed neurons
(v) Neuroscience
(vi) Sensory neurons
(vii) Motor neurons
(viii) White matter
(ix) White matter
(x) Dura mater
(xi) Neuron
(xii) Meninges
(xiii) Cranium
(xiv) Neocortex / Neopallium
(xv) Limbic system
(xvi) Corpora quadrigemina
(xvii) Olfactory Lobes
(xviii) Median fissure
(xix) Agraphia
(xx) Brain
(xxi) Aphasia
(xxii) Trigeminal nerve
(xxiii) Sympathetic nervous system
(xxiv) Dendrites
(xxv) Bipolar neuron
(xxvi) Sclera
(xxvii) Myopia
(xxviii) Semicircular canal
(xxix) Rhodopsin

Chapter 9 - Nervous System Exercise 116

Solution 5
(i) Nerve impulse - It is an electrochemical change occurring in the membrane of a nerve fibre produced by a stimulus.
(ii) Axon - It is a fibre like process of the neuron which carries impulses away from the cell body.
(iii) Cyton - It is an oval, angular, polygonal or stellate body which contains a large central nucleus.
(iv) Action potential - A momentary change in electrical potential on the surface of a cell, or a nerve or muscle cell, that occurs when it is stimulated, resulting in the transmission of an electrical impulse.
(v) Reflex action - It is an immediate and involuntary response to a stimulus.
(vi) Yellow spot - It is the region of best vision where more cone cells are present.
(vii) Blind spot - It is the region of no image formation because of lack of cone cells.
(viii) Power of accommodation - It is the ability of the lens to focus on far and distant objects.
Solution 6
Solution 7
Solution 3
(i) Nephron
(ii) Blind spot
(iii) Myelin
(iv) Olfactory lobe
(v) Cranial nerve
Solution 4

Chapter - Exercise

Solution
Solution

Chapter 9 - Nervous System Exercise 117

Solution 8
Solution 9

Chapter 9 - Nervous System Exercise 118

Solution 20
The arrangement of neurons in
Cerebrum: cytons are present outside and axons are inside
Spinal cord: cytons are present inside and axons are outside.
Solution 21
Functions of medulla oblongata -
(i) It controls the involuntary activities like - respiration, circulation, digestion, etc.
(ii) It controls the dilation and constriction of blood vessels.
Solution 22
Reflex action - It is an immediate and involuntary response to a stimulus.
Example - 1. Blinking of eyelids on exposure to light .
2. Knee jerk.
Solution 11
(i) Meninges - It is located around the brain and spinal cord.
(ii) Ganglia - It is located outside the brain and spinal cord.
(iii) Cerebellum - It is located behind cerebrum and above medulla oblongata in the brain.
(iv) Nodes of Ranvier - It is located on the unmyelinated areas on the axon.
(v) Effector organs - It is located in muscle , gland or any organ of the body.
Solution 12
Solution 13
Solution 14
(i) Iris: It is located in the eye. Its function is to protect the eyeball and controls the size of the pupil.
(ii) Semicircular canals: It is located in the inner ear. These are concerned with the body equilibrium.
Solution 15
Following are the two examples of reflex actions in our daily life :
(i) Removing hand suddenly when pricked by a thorn.
(ii) Blinking of eyelids on exposure to light.
Solution 16
(i) Reflex action - It is an immediate and involuntary response to a stimulus.
(ii) Example of a conditioned reflex: Tying one's shoe lace.
Solution 17
(i) (a) Bone of skull
(b) Inner ear
(c) Eardrum
(d) Bone of skull
(e) Bone of middle ear
(f) Middle ear
(g) Air filled
(ii) (b) Inner ear - It transmits the impulse to brain.
(d) Bone of skull - It helps in fixing the position of the ears to help the brain use auditory cues to judge direction and distance of sounds.
(g) Air filled - It keeps the pressure in the middle ear equalized with pressure in the outside.
(iii) The main division of the ear are: outer ear, middle ear and inner ear.
(iv) Stirrup
(v) The labyrinth is the inner ear which consists of utriculus, sacculus, cochlea and three semicircular canals.
Solution 18
(i) A - Semi-circular canal
B - Utriculus
C - Sacculus
D - Cochlea
(ii) Auditory nerve.
(iii) 1. Utriculus and sacculus
2. Semi-circular canal
3. Cochlea
(iv) Sensory cells of organ of Corti
(v) Perilymph
Solution 19
(i) Cochlea - It helps in hearing by transmitting impulses to the brain through auditory nerves.
(ii) Fovea centralis - It is a point at retina where more cone cells are concentrated and thus produces sharpest vision.
(iii) Three semicircular canals - It maintains the dynamic equilibrium.
(iv) Retina - It prevents the reflection of light.
(v) Lachrymal glands - It produces tear to lubricate the eyeball.

Chapter 9 - Nervous System Exercise 119

Solution 23
Solution 24
Cone cells.
Solution 25
Solution 26
Solution 27
(i) Cochlea: It helps in hearing by transmitting impulses to the brain through auditory nerves.
(ii) Meninges: It provides protection to brain and spinal cord.
Solution 28
One feels blinded for a short while on coming out of a dark room.This is called light adaptation of the eye.It is due to the constriction of the pupil to prevent the entry of light into the eye and pigment rhodopsin is bleached to reduce the sensitivity of the rods.
Solution 29
(i) Iris
(ii) Cerebrospinal fluid
Solution 30
(i) True
(ii) True
(iii) True
(iv) True
(v) False
(vi) True
(vii) False
(viii) False

Chapter 9 - Nervous System Exercise 120

Solution 31
(i) (d) nerve cell
(ii) (b) cerebrum
(iii) (a) 31
(iv) (b) 12
(v) (a) dura mater
(vi) (a) ear
(vii) (c) rhodopsin
(viii) (a) twilight vision
(ix) (d) macula
(x) (d) two nerves
(xi) (c) hearing
(xii) (b) 31
(xiii) (a) eustachian
(xiv) (c) iris
(xv) (b) cones
(xvi) (b) Ear
(xvii) (d) corpus callosum
(xviii) (d) eye
(xix) (d) filter light
(xx) (b) the two cerebral hemispheres