Solution 4:<\/strong><\/span>
\n
<\/p>\nSolution 5:<\/strong><\/span><\/p>\n\n- Nerve impulse –<\/strong> It is an electrochemical change occurring in the membrane of a nerve fibre produced by a stimulus.<\/li>\n
- Axon –<\/strong> It is a fibre like process of the neuron which carries impulses away from the cell body.<\/li>\n
- Cyton –<\/strong> It is an oval, angular, polygonal or stellate body which contains a large central nucleus.<\/li>\n
- Action potential –<\/strong> 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.<\/li>\n
- Reflex action –<\/strong> It is an immediate and involuntary response to a stimulus.<\/li>\n
- Yellow spot –<\/strong> It is the region of best vision where more cone cells are present.<\/li>\n
- Blind spot –<\/strong> It is the region of no image formation because of lack of cone cells.<\/li>\n
- Power of accommodation –<\/strong> It is the ability of the lens to focus on far and distant objects.<\/li>\n<\/ol>\n
Solution 6:<\/strong><\/span>
\n![\"Frank](\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2018\/01\/Frank-ICSE-Class-10-Biology-Solutions-Nervous-System-2.png\")
\n
<\/p>\nSolution 7:<\/strong><\/span>
\n
<\/p>\nPAGE NO : 117<\/span><\/strong>
\nSolution 8:<\/strong><\/span>
\n
<\/p>\nSolution 9:<\/strong><\/span>
\n
<\/p>\nSolution 10:<\/strong><\/span><\/p>\n\n- A – Cerebrum; B – Cerebellum; C – Medulla oblongata<\/li>\n
- (A) Cerebrum –<\/strong> It is concerned with intelligence, memory and voluntary activities.<\/li>\n
- Cerebellum –<\/strong> It is concerned with body equilibrium.<\/li>\n
- Medulla oblongata It controls all involuntary activities like heart beat, respiration, etc.
\nThe three protective membranes covering the brain are :<\/p>\n\n- \u00a0Dura mater<\/li>\n
- Arachnoid mater<\/li>\n
- Pia mater.<\/li>\n<\/ul>\n<\/li>\n
- Neuron is the basic unit of the brain.<\/li>\n<\/ol>\n
PAGE NO : 118<\/span><\/strong><\/p>\nSolution 11:<\/strong><\/span><\/p>\n\n- Meninges –<\/strong> It is located around the brain and spinal cord.<\/li>\n
- Ganglia –<\/strong> It is located outside the brain and spinal cord.<\/li>\n
- Cerebellum –<\/strong> It is located behind cerebrum and above medulla oblongata in the brain.<\/li>\n
- Nodes of Ranvier –<\/strong> It is located on the unmyelinated areas on the axon.<\/li>\n
- Effector organs –<\/strong> It is located in muscle , gland or any organ of the body.<\/li>\n<\/ol>\n
Solution 12:<\/strong><\/span>
\n
<\/p>\nSolution 13:<\/strong><\/span>
\n
<\/p>\nSolution 14:<\/strong><\/span><\/p>\n\n- Iris:<\/strong> It is located in the eye. Its function is to protect the eyeball and controls the size of the pupil.<\/li>\n
- Semicircular canals:<\/strong> It is located in the inner ear. These are concerned with the body equilibrium.<\/li>\n<\/ol>\n
Solution 15:<\/strong><\/span>
\nFollowing are the two examples of reflex actions in our daily life :<\/p>\n\n- Removing hand suddenly when pricked by a thorn.<\/li>\n
- Blinking of eyelids on exposure to light.<\/li>\n<\/ol>\n
Solution 16:<\/strong><\/span><\/p>\n\n- Reflex action –<\/strong> It is an immediate and involuntary response to a stimulus.<\/li>\n
- Example of a conditioned reflex:<\/strong> Tying one’s shoe lace.<\/li>\n<\/ol>\n
Solution 17:<\/strong><\/span><\/p>\n\n- (a) Bone of skull<\/li>\n
- (b) Inner ear<\/li>\n
- (c) Eardrum<\/li>\n
- (d) Bone of skull<\/li>\n
- (e) Bone of middle ear<\/li>\n
- (f) Middle ear<\/li>\n
- (g) Air filled<\/li>\n
- (ii) (b) Inner ear –<\/strong> It transmits the impulse to brain.<\/li>\n
- (d) Bone of skull –<\/strong> It helps in fixing the position of the ears to help the brain use auditory cues to judge direction and distance of sounds.<\/li>\n
- (g) Air filled –<\/strong> It keeps the pressure in the middle ear equalized with pressure in the outside.<\/li>\n
- (iii) The main division of the ear are: outer ear, middle ear and inner ear.<\/li>\n
- (iv) Stirrup<\/li>\n
- (v) The labyrinth is the inner ear which consists of utriculus, sacculus, cochlea and three semicircular canals.<\/li>\n<\/ol>\n
Solution 18:<\/strong><\/span><\/p>\n\n- A – Semi-circular canal
\nB – Utriculus
\nC – Sacculus
\nD – Cochlea
\n(ii) Auditory nerve.
\n(iii) 1. Utriculus and sacculus<\/li>\n - Semi-circular canal<\/li>\n
- Cochlea<\/li>\n
- Sensory cells of organ of Corti<\/li>\n
- Perilymph<\/li>\n<\/ol>\n
Solution 19:<\/strong><\/span><\/p>\n\n- Cochlea –<\/strong> It helps in hearing by transmitting impulses to the brain through auditory nerves.<\/li>\n
- Fovea centralis –<\/strong> It is a point at retina where more cone cells are concentrated and thus produces sharpest vision.<\/li>\n
- Three semicircular canals –<\/strong> It maintains the dynamic equilibrium.<\/li>\n
- Retina –<\/strong> It prevents the reflection of light.<\/li>\n
- Lachrymal glands –<\/strong> It produces tear to lubricate the eyeball.<\/li>\n<\/ol>\n
Solution 20:<\/strong><\/span>
\nThe arrangement of neurons in
\nCerebrum:<\/strong> cytons are present outside and axons are inside
\nSpinal cord:<\/strong> cytons are present inside and axons are outside.<\/p>\nSolution 211:<\/strong><\/span>
\nFunctions of medulla oblongata –<\/p>\n\n- It controls the involuntary activities like – respiration, circulation, digestion, etc.<\/li>\n
- It controls the dilation and constriction of blood vessels.<\/li>\n<\/ol>\n
Solution 22:<\/strong><\/span>
\nReflex action –<\/strong> It is an immediate and involuntary response to a stimulus.
\nExample –<\/strong> 1. Blinking of eyelids on exposure to light .
\n2. Knee jerk.<\/p>\nPAGE NO : 119<\/span><\/strong><\/p>\nSolution 23:<\/strong><\/span>
\n
<\/p>\nSolution 24:<\/strong><\/span>
\nCone cells.<\/p>\nSolution 25:<\/strong><\/span>
\n
<\/p>\nSolution 26:<\/strong><\/span>
\n
<\/p>\nSolution 27:<\/strong><\/span><\/p>\n\n- Cochlea:<\/strong> It helps in hearing by transmitting impulses to the brain through auditory nerves.<\/li>\n
- Meninges:<\/strong> It provides protection to brain and spinal cord.<\/li>\n<\/ol>\n
Solution 28:<\/strong><\/span>
\nOne 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.<\/p>\nSolution 29:<\/strong><\/span><\/p>\n\n- Iris<\/li>\n
- Cerebrospinal fluid<\/li>\n<\/ol>\n
Solution 30:<\/strong><\/span><\/p>\n\n- True<\/li>\n
- True<\/li>\n
- True<\/li>\n
- True<\/li>\n
- False<\/li>\n
- True<\/li>\n
- \u00a0False<\/li>\n
- False<\/li>\n<\/ol>\n
PAGE NO : 120<\/span><\/strong>
\nSolution 31:<\/strong><\/span><\/p>\n\n- (d) nerve cell<\/li>\n
- (b) cerebrum<\/li>\n
- (a) 31<\/li>\n
- (b) 12<\/li>\n
- (a) dura mater<\/li>\n
- (a) ear<\/li>\n
- (c) rhodopsin<\/li>\n
- (a) twilight vision<\/li>\n
- (d) macula<\/li>\n
- (d) two nerves<\/li>\n
- (c) hearing<\/li>\n
- (b) 31<\/li>\n
- (a) eustachian<\/li>\n
- (c) iris<\/li>\n
- (b) cones<\/li>\n
- (b) Ear<\/li>\n
- (d) corpus callosum<\/li>\n
- (d) eye<\/li>\n
- (d) filter light<\/li>\n
- (b) the two cerebral hemispheres<\/li>\n<\/ol>\n
Biology<\/a>Chemistry<\/a>Physics<\/a>Maths<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"Frank ICSE Class 10 Biology Solutions – Nervous System PAGE NO 115 Solution 1: Central Nervous System Autonomic Nervous System Conus medullaris \/ Medullary cone Mixed neurons Neuroscience Sensory neurons Motor neurons White matter White matter Dura mater Neuron Meninges Cranium Neocortex \/ Neopallium Limbic system Corpora quadrigemina Olfactory Lobes Median fissure Agraphia Brain Aphasia … Read more<\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[172,6444,3034],"tags":[6813,6808,6807,6809,6806,6812,6810,6811],"yoast_head":"\nFrank ICSE Class 10 Biology Solutions - Nervous System - CBSE Library<\/title>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\t\n\t\n\t\n