Neural Control and Co-ordination Past Exam Questions PDF

Neural Control CHAPTER 21 and Co-ordination prACtiCe Questions Human Neural System 1. Select the incorrect statement: (a) Coordination is the process through which two or more organ interac...

Neural Control CHAPTER 21 and Co-ordination prACtiCe Questions Human Neural System 1. Select the incorrect statement: (a) Coordination is the process through which two or more organ interact and complement the function of one another. (b) Neural system provides on organized network of point to point connection for quick coordination. (c) Neural organization is complex in lower invertebrates. (d) Vertebrates have more developed neural system. 2. Human neural system A B Brain C Somatic neural Autonomic neural system system D E Identify A, B, C, D and E: (a) A–Central Nervous System (CNS), B–Peripheral Nervous System (PNS), C–Spinal cord, D–Sympathetic Neural System, E–Parasympathetic Neural System (b) A–Peripheral Nervous System (PNS), B–Parasympathetic Neural System, C–Central Nervous System (CNS), D–Sympathetic Neural System, E–Spinal cord (c) A–Parasympathetic Neural System, B–Spinal cord, C–Central Nervous System (CNS), D–Sympathetic Neural System, E–Peripheral Nervous System (PNS) (d) A–Central Nervous System (CNS), B–Spinal cord, C–Peripheral Nervous System (PNS), D–Sympathetic Neural System, E–Parasympathetic Neural System 21.2 Neural Control and Co-ordination 3. Somatic neural system transmits impulse to (a) Skeletal muscles (b) Involuntary organs (c) Smooth muscles (d) All of these 4. Which of the following lacks a neural system? (a) Hydra (b) Silver fish (c) Spongia (Sponges) (d) Ophiura 5. Nervous system of hydra is composed of (a) Ganglia chain (b) Vertical ganglion chain interconnected by commissure (c) Network of nerves (d) Brain 6. Nissl’s granules are found in all except (a) Cyton (b) Dendrites (c) Axon (d) Cell body 7. Which of the following system relays impulse from CNS to skeletal muscles? (a) Somatic neural system (b) Sympathetic neural system (c) Parasympathetic neural system (d) Autonomic neural system 8. Dendrites transmit impulse ____ cell body and axon transmits impulse ____ cell body. (a) towards, away from (b) away, towards (c) towards, towards (d) away, away 9. Bipolar axons are found in (a) Retina of eye (b) Cerebral cortex (c) Mesencephalon (d) Embryonic stage 10. Unipolar axons are found in (a) Respiratory epithelium (b) Retina (c) Embryo (d) Cerebral cortex 11. Schwann cell is absent in (a) Myelinated neuron (b) Non myelinated (c) Astrocytes (d) Both (b) and (c) 12. Neuron can (a) Detect stimuli (b) Receive stimuli (c) Transmit stimuli (d) All of these 13. Neuron is a _____ structure composed of three major parts cell body _____ and axon. (a) Macroscopic, dendrites (b) Microscopic, dendrites (c) Microscopic, cyton (d) Microscopic, soma Neural Control and Co-ordination21.3 14. Question A and B is related to digram given below. A Nissl’s granules B Nucleus Schwan cell C Myelin sheath D Axon terminal Synaptic knob Structure of a neuron A) Which part do not contain Nissl’s granule? (a) A (b) B (c) C (d) All of these B) Which path of transmission is correct? (a) A→B→C (b) B → A → C (c) C→B→A (d) B → A → B → C 15. Match the Column: Column I Column II A. Unipolar – 1. Cell body with one axon only, found usually in the embryonic stage. B. Bipolar – 2. Cell body with one axon and two or more dendrites, found in cerebral cortex. C. Multipolar – 3. Cell body with one axon and one dendrite, found in retina of eye. (a) A−1, B−3, C−2 (b) A−2, B−1, C−3 (c) A−3, B−2, C−1 (d) A−1, B−2, C−3 16. Myelinated nerve fibre is found in (a) Spinal nerve (b) Cranial nerve (c) Both (a) and (b) (d) None of these 21.4 Neural Control and Co-ordination 17. Unmyelinated nerve fibres are commonly found in (a) ANS (b) Somatic neural system (c) Both (a) and (b) (d) None of these Central Nervous System 18. The outermost of the 3 cranial meninges is (a) Arachnoid (b) Dura (c) Pia (d) Sclera 19. Brain stem is formed by (a) Fore brain (b) Mid brain (c) Hind brain (d) Both (b) and (c) 20. Right and left cerebral hemispheres are connected via (a) Corpus striatum (b) Corpus callosum (c) Thalamus (d) Hippocampus 21. Forebrain consist of (a) Cerebrum (b) Thalamus (c) Hypothalamus (d) All of these 22. The cerebrum is made up of how many cerebral hemisphere? (a) 1 (b) 2 (c) 3 (d) 4 23. Select the incorrect statement: (a) Cerebral cortex, greyish in appearance thrown into prominent folds known as sulci and gyri. (b) Concentrated neuron cell body gives grey color to the cerebral cortex. (c) Fibres of the tract, covered with myelin sheath, constitute inner part of cerebral hemisphere. (d) Cerebrum is wrapped around the structure called medulla. 24. Cerebral cortex contains (a) Sensory area (b) Motor area (c) Large association area (d) All of these 25. The association area in cerebral cortex is responsible for (a) Inter sensory association (b) Memory (c) Communication (d) All of these 26. The major coordinating centre for sensory and motor signaling is (a) Thalamus (b) Hypothalamus (c) Medulla (d) Pons 27. Hypothalamus contain the brain centre which controls the (a) Body temperature (b) Urge for eating (c) Urge for drinking (d) All of these 28. Which of the following is true about hypothalamus? (a) Situated at the base of thalamus (b) Contains neurosecretory cell (c) It contains the centre for thermoregulation (d) All of these 29. Limbic system consists of (a) Amygdala (b) Hippocampus (c) Both (a) and (b) (d) None of these 30. The part of brain located between the thalamus, hypothalamus of fore brain and pons is known as (a) Mid-brain (b) Hind-brain (c) Limbic system (d) All of these Neural Control and Co-ordination21.5 31. Which of the following is true about midbrain? (a) A canal called cerebral aqueduct passes through the mid-brain. (b)  The dorsal portion of mid-brain consists of four round swelling called corpora quadrigemina. (c) It forms the part of brain stem. (d) All the above 32. The hind-brain consists of (a) Pons (b) Medulla oblongata (c) Cerebellum (d) All of these 33. Hypothalamus controls (a) Body’s thermostat (b) Respiration (c) Gastric secretions (d) All of these 34. Limbic system controls (a) Sexual behaviour (b) Motivation (c) Affection (d) All of these 35. Corpora quadrigemina are present on _____ portion of Mesencephalon (midbrain). (a) Anterior (b) Dorsal (c) Ventral (d) Lateral 36. Which of the following is false about hind-brain? (a) Pons, a part of it consist of fibre tracts that interconnects different regions of brain. (b) The cerebellum part of it has very convoluted surface to accommodate many neurons. (c) Medulla of this part is connected to the spinal cord. (d) The hind-brain is known for regular excitement, pleasure, rag and fear. 37. Medulla contains the centre for (a) Respiration (b) Cardiovascular reflex (c) Gastric Secretion (d) All of these 38. Which of the following consists of fibre tracts interconnecting the different regions of brain? (a) Cerebellum (b) Pons varoli (c) Medulla (d) All of these 39. Which of the following helps in the regulation of respiration? (a) Medulla (b) Cerebral cortex (c) Pons (d) Both (a) and (c) 40. Reflex action is under (a) CNS (b) Spiral cord (c) Peripheral Nervous Stimulation (d) Voluntary response 41. The dorsal nerve root ganglion is (a) Bipolar (b) Unipolar (c) Pseudounipolar (d) Multipolar 42. In spiral cord of humans, the grey matter is _____ shaped. (a) Circular (b) Irregular (c) Butterfly (d) None of these 43. White matter is _____ in brain and _____ in spiral cord (in case of humans) (a) Outside, inside (b) In, out (c) In, in (d) Out, out 44. Resting axonal membrane is (a) Unpolarized (b) Unpolarized and more permeable to K+ (c) Polarized and more permeable to Na+ (d) Polarized and more permeable to K+ 21.6 Neural Control and Co-ordination 45. Na/K pumps transports (a) 3Na+ out for 2K+ in (b) 3Na+ in for 2K+ out (c) 2Na+ out for 3K+ in (d) 2Na+ in for 3K+ out 46. Which of the following is true about neural membrane? (a) Different type of ion channels present. (b) Ion channels are selectively permeable. (c) Impermeable to negatively charged protein present in axoplasm. (d) All the above 47. Axoplasm have (polarized) (a) High K+ ion (b) Low Na+ ion (c) Negatively charged proteins (d) All of these 48. The electrical potential difference across the resting plasma membrane is called as (a) Spike potential (b) Action potential (c) Resting potential (d) All of these 49. Depolarization occurs due to (a) Influx of Na+ (b) Eflux of Na+ (c) Influx of K+ (d) Eflux of K+ 50. The correct sequence for depolarization and repolarization is (A) Stimulus applied at a site on polarized membrane (B) Increase the permeability for Na+ (C) Generation of A.P.(Action Potential) (D) Increase the permeability for K+ (E) Restoration of membrane potential (a) A → B → C → D → E (b) B → A → C → D → E (c) A → D → C → B → E (d) A → B → D → C → E 51. Unidirectional transmission of the nerve impulse is maintained by (a) Interneurons (b) Myelin sheath (c) Synapse (d) Membrane polarity 52. Select the total number of true statements from the following. 1) There are two types of synapses, namely electrical synapses and chemical synapses. 2) Electrical synapses are rare in our system. 3) At chemical synapse, the membranes of pre- and post-synaptic neuron are in very close proximity. 4) Transmission of an impulse across electrical synapses is very similar to impulse conduction along a single axon. 5) At a chemical synapse, the membrane of the pre- and post-synaptic neurons are separated by a fluid-filled space called synaptic cleft. (a) 2 (b) 3 (c) 4 (d) 5 53. Chemicals called _____ are involved in the transmission of impulses at chemical synapse. (a) Neurohormones (b) Neurotransmitters (c) Receptors (d) Interferon 54. Which element ion helps in releasing Ach at synaptic cleft? (a) Na+ (b) K+ (c) Ca+2 (d) PO43- Neural Control and Co-ordination21.7 55. The new potential developed on post-synaptic membrane is (a) Excitatory always (b) Inhibitory always (c) May be excitatory or inhibitory (d) Neither excitatory nor inhibitory 56. Identify A to H in the given figure. A B C D E F G H (a) A—Neurotransmitters, B—Pre-synaptic membrane, C—Receptors, D—Axon, E—Synaptic vesicles, F—Axon terminal, G—Synaptic cleft, H—Post-synaptic membrane (b) A—Axon, B—Axon terminal, C—Synaptic vesicles, D—Pre-synaptic membrane, E—Synaptic cleft, F—Post-synaptic membrane, G—receptors, H—Neurotransmitters (c) A—Receptors, B—Post-synaptic membrane, C—Pre-synaptic membrane, D—Axon terminal, E—Neurotransmitters, F—Synaptic cleft, G—Synaptic vesicles, H—Axon (d) A—Axon terminal, B—Neurotransmitters, C—Synaptic vesicles, D—Axon, E—Pre- synaptic membrane, F—Post-synaptic membrane, G—Synaptic vesicles, H—Synaptic cleft 57. Reflex action (a) Occurs involuntarily (b) Requires the involvement of CNS (c) Protective (d) All of these 58. Smallest reflex consists of (a) Afferent neuron (Receptor) (b) Efferent neuron (effector or excitor) (c) Both (a) and (b) (d) None of these 59. In reflex action, the reflex arc is formed by (a) Muscle, receptor, brain (b) Brain, spinal cord, muscle (c) Receptor, spinal cord, muscle (d) Receptor, muscle, spinal cord 60. Which of the following are due to reflex action? (a) Vomiting (b) Sneezing (c) Coughing (d) All of these 61. Which of the following are example of reflexes? (a) Knee-jerk reflex (b) Corneal reflex (c) Papillary reflex (d) All of these 21.8 Neural Control and Co-ordination 62. In the diagram of the lateral view of the human brain, the parts are indicated by alphabets. Choose the answer in which these alphabets have been correctly matched with the parts which they indicate? A E B C D (a) A–Temporal lobe, B–Parietal lobe, C–Cerebellum, D–Medulla oblongata, E–Frontal lobe (b) A–Frontal lobe, B–Temporal lobe, C–Cerebrum, D–Medulla oblongata, E–Occipital lobe (c) A–Temporal lobe, B–Parietal lobe, C–Cerebrum, D–Medulla oblongata, E–Frontal lobe (d) A–Frontal lobe, B–Temporal lobe, C–Cerebellum, D–Medulla oblongata, E–Occipital lobe 63. The site for processing of vision, hearing, speech, memory, intelligence, emotions and thoughts is (a) Brain (b) Hear (c) Lungs (d) Kidney 64. Eyes are located in (a) Eye orbits (b) Depression in sphenoid bone (c) Both (a) and (b) (d) None of these 65. Choroid is blue due to _________ (a) Lack of O2 in tissues (b) Due to pigment (c) Excess of blood vessels (d) None of these 66. Choroid thickens anteriorly to form (a) Iris (b) Ciliary body (c) Suspensory ligaments (d) None of these 67. The diameter of pupil is regulated by (a) Lens (b) Ciliary muscles (c) Muscles of iris (d) All of these 68. Cells located in retina are (a) Photoreceptor cells (b) Bipolar cell (c) Ganglion cells (d) All of these 69. Layers in the wall of eyeballs from inside outwards are (a) Retina, choroid, sclerotic (b) Sclerotic, choroid, retina (c) Choroid, retina, sclerotic (d) Choroid, sclerotic, retina 70. Which layer of an eyeball wall contains abundant blood vessels? (a) Lens (b) Retina (c) Choroid (d) Sclerotic Neural Control and Co-ordination21.9 71. Iris is a part of (a) Choroid only (b) Retina only (c) Sclera and choroid (d) Choroid and retina 72. The size of aperture of the pupil of one eye is controlled by (a) Iris (b) Retina (c) Cornea (d) Conjunctiva 73. Eye lens of a man is (a) Biconcave (b) Biconvex (c) Concave (d) Convex 74. Cornea is a transparent part of (a) Choroid (b) Sclera (c) Conjunctiva (d) Retina 75. The second layer of the eyeball is called (a) Choroid (b) Retina (c) Cornea (d) Sclera 76. The iris of the eye is an extension of (a) Cornea (b) Sclerotic (c) Retina (d) Choroid 77. The suspensory ligament (Zonule of Zinn) is a part of (a) Tongue (b) Brain (c) Heart (d) Eye 78. The choroid layer is thin over the _________ of the eye ball (a) Anterior two-third (b) Posterior two-third (c) Lateral two-third (d) Posterior one-third 79. Find out the incorrect statement: (a) Lens is a transparent and crystalline structure. (b) Iris is pigmented and opaque layer. (c) The aperture surrounded by iris is called pupil. (d) Twilight vision is the function of cones. 80. Aqueous humor is present (a) In front of the retina (b) In front of cornea (c) Behind the conjunctiva (d) In front of lens 81. Retinal cells involved in colour vision are (a) Cones (b) Rods (c) Neurons (d) Neuroglial cells 82. Which of the following is not a basic colour in trichromatic vision? (a) Red (b) Yellow (c) Green (d) Blue 83. Anterior chamber of the eye is the space between (a) Cornea and lens (b) Cornea and iris (c) Lens and retina (d) Lens and iris 84. Which of the following passes from lens to blindspot? (a) Eustachian canal (b) Canal of Schlemm (c) Hyaloid canal (d) Semicircular canal 85. Colour vision in man is (a) Trichromatic (b) Bichromatic (c) Monochromatic (d) Achromatic 86. Quantum of light entering the eye through the pupil is dependent on (a) Ciliary body (b) Lens (c) Retina (d) Iris 21.10 Neural Control and Co-ordination 87. Rhodopsin is a constituent of (a) Choroid (b) Sclera (c) Cornea (d) None 88. In nocturnal birds, the retina mostly contains (a) Cones (b) Rods (c) Both in equal numbers (d) None of these 89. Macula lutea is located (a) In the middle of retina (b) Below lens (c) Below pupil (d) At posterior polylateral to blind spot 90. Photopic vision is associated with (a) Rods (b) Cones (c) Both (a) and (b) (d) None of these 91. Retina is the most sensitive at (a) Optic disc (b) Periphery (c) Macula lutea (d) Fovea centralis 92. The aperture controlling light passage in the eye is (a) Pupil (b) Sclerotic (c) Blindspot (d) Iris 93. The space between cornea and lens is (a) Aqueous chamber (b) Vitreous chamber (c) Canal of Schlemm (d) Fovea centralis 94. Cones are sensitive to (a) Dim light only (b) Bright light only (c) Both dim and bright light (d) None of these 95. Colour is perceived by (a) Rods in retina (b) Cones in retina (c) Corneal-lens complex (d) Lens 96. Rhodopsin (visual purple) of the eye will require (a) Guava (b) Carrot (c) Mango (d) Wheat 97. Area of the most acute vision in the eye where sharp and bright image formed is (a) Yellow spot (b) Blindspot (c) Pupil (d) Lens 98. An area of the retina which does not have rods or cones are (a) Red spot (b) Blue spot (c) Blind spot (d) Black spot 99. Vitamin A combines with a protein in the retina to produce (a) Glaucoma (b) Night blindness (c) Rhodopsin (d) Colour blindness 100. The fovea is a _________ portion of the _________ (a) Thick-out, sclera (b) Thin-out, choroid (c) Thin-out, retina (d) Thick-out, retina 101. When all three types of cones are stimulated equally, a sensation of _________ light is produced? (a) Black (b) White (c) Blue (d) Green Neural Control and Co-ordination21.11 102. Select the incorrect matching: Part Function (a) Optic nerve – Carry impulse to visual cortex (b) Cones – Colour vision (c) Cornea and lens – Focusing of light on retina (d) Pupil – Generate action potential 103. Vitreous chamber is filled with (a) Transparent sol called vitreous humour (b) Transparent gel called vitreous humour (c) Opaque sol called vitreous humour (d) Opaque gel called vitreous humour 104. Select the incorrect statement from the following: (a) Rhodopsin is also known as visual purple. (b) Rods contain a purplish-red protein, which in turn contains the derivative of Vitamin A. (c) In human eye three type of cones are present. (d) At fovea of retina, the resolution (visual acuity) is minimum. 105. The location at which Optic nerve leaves the eye balls is (a) Slightly below the posterior pole of eye ball (b) Slightly above the posterior pole of eye ball (c) Anterior pole of eye ball (d) Macula lutea 106. Arrange the following steps of mechanism of vision in order. (1) Light induces dissociation of the retinal from opsin. (2) Change in the structure of opsin. (3) Change in membrane permeability. (4) Potential differences are generated in photoreceptor cells. (5) Generation of AP is ganglion cell through bipolar cells. (6) AP is transmitted via optic nerve to visual cortex. (7) At visual cortex, nerve impulses are analysed and the image formed on retina is recognized based on the earlier memory and experience. (8) Focusing of visible light on retina. (a) 8,1,2,3,4,5,6,7 (b) 8,1,7,2,6,3,5,4 (c) 1,2,3,4,5,6,7,8 (d) 8,7,6,5,4,3,2,1 107. Ear performs which of the following sensory functions? (A) Vision (B) Olfaction (C) Hearing (D) Maintenance of body balance (a) A, B, C (b) B and C Only (c) C and D Only (d) C Only 21.12 Neural Control and Co-ordination 108. Identify A to F in the given figure. A B C F E D (a) A–Cochlear nerve, B–Incus, C–Eustachian tube, D–Cochlea, E–External auditory canal, F–Tympanic membrane (b) A–External auditory canal, B–Eustachian tube, C–Temporal bone, D–Steps in oval window, E–Tympanic membrane, F–Cochlear nerve (c) A–Cochlea, B–Tympanic membrane, C–Incus, D–Cochlear nerve, E–Eustachian tube, F–External auditory canal (d) A–Temporal bone, B–Steps in oval window, C–Cochlear nerve, D–Eustachian tube, E–Tympanic membrane, F–External auditory canal 109. Anatomically the ear can be divided into how many major sections? (a) 1 (b) 2 (c) 3 (d) 4 110. Ear is divided into (a) Outer ear (b) Middle ear (c) Inner ear (d) All of these 111. Tympanic membrane consists of (a) Skin on outside (b) Connective tissue in middle part (c) Mucus membrane on inside (d) All of these 112. The _________ is attached to the tympanic membrane and the _________ is attached to the oval window of the cochlea. (a) Malleus, Incus (b) Incus, Stapes (c) Malleus, Stapes (d) Stapes, Malleus 113. Select the incorrect statement: (a) Eustachian tube connects the middle ear cavity with the pharynx. (b) The eustachian tube helps in equalizing the pressure on either sides of ear drum. (c) Oval window is a part of cochlea. (d) The ear ossicle decreases the efficiency of transmission of sound waves to the inner ear. 114. Select the correct matching: (a) Inner ear ossicle → Malleus, incus and stapes (b) Scala media → Filled with perilymph (c) Fluid filled inner ear → Labyrinth (d) Bony labyrinth → Surrounded by tympanic membrane 115. Inner ear contains all except (a) Reissner’s membrane (b) Basilar membrane (c) Cochlea (d) Stapes Neural Control and Co-ordination21.13 116. Select the total number of true statement from the following: (1) Scala vestibuli ends at the oval window. (2) Scala tympani terminates at round window. (3) Vestibular apparatus is located above cochlea. (4) Otolith organ consists of saccule and utricle. (a) 1 (b) 2 (c) 3 (d) 4 117. Vestibular apparatus consists of (a) Three semicircular canal (b) Saccule (c) Utricle (d) All of these 118. Specific receptors of the vestibular apparatus responsible for the maintenance of balance of the body and posture is (a) Macula (b) Crista (c) Organ of corti (d) Both (a) and (b) 119. Each semicircular canal lies in a different plane at _________ angle to each other. (a) 45o (b) 60o (c) 90o (d) 120o 120. In man the receptors stimulated by sound waves are (a) Organ of corti (b) Semicircular canal (c) Utriculus (d) Sacculus 121. Scala vestibuli is connected with (a) Scala media (b) Fenestra ovalis (c) Scala tympani (d) Fenestra rotundus 122. The cochlea of mammalian internal ear is concerned with (a) Hearing (b) Balance of body posture (c) Both (a) and (b) (d) Perception changes of atmospheric pressure 123. Identify the correct sequence of organs/regions in the organization of human ear as an a­ uditory mechanoreceptor organ. (a) Pinna–Cochlea–Tympanic membrane–Auditory canal–Malleus–Stapes–Incus–Auditory nerve (b) Pinna–Auditory canal–Tympanic membrane–Malleus–Incus–Stapes–Cochlea–Auditory nerve (c) Pinna–Tympanic membrane–Auditory canal–Incus–Malleus–Stapes–Cochlea–Auditory nerve (d) Pinna–Malleus–Incus–Stapes–Auditory canal–Tympanic membrane–Cochlea–Auditory nerve 124. Internal ear is filled with (a) Perilymph (b) Endolymph (c) Lymph (d) Both (a) and (b) 125. Reissner’s membrane is found in (a) Cochlea of mammal (b) Eye of mammal (c) Heart of mammal (d) Nasal duct of mammal 126. In the internal ear, the organ of Corti which bears hair cells is located in (a) Sacculus (b) Scala media (c) Scala tympani (d) Scala vestibuli 21.14 Neural Control and Co-ordination 127. Equilibrium of the body is maintained by (a) Sacculus and cochlea (b) Semicircular canals and utriculus (c) Eustachian tube (d) Ear ossicles 128. Which of the following senses is affected if the tectorial membrane is removed from human? (a) Balance (b) Hearing (c) Vision (d) Smell 129. Malleus (hammer shape), incus (anvil shape) and stapes (stirrup shape) are present in (a) Internal ear of frog (b) Middle ear of human (c) Eye of rabbit (d) Eye of frog 130. The waxy substance that coats the surface of auditory canal is produced by (a) Harderian glands (b) Meibomian glands (c) Zeis glands (d) Ceruminous glands (sebaceous gland) 131. Macula in man are present in (a) Semicircular canals (b) Utriculus (c) Sacculus (d) Both utriculus and sacculus 132. Which of the following parts in your body is concerned with the sense of balance? (a) Eustachian tube (b) Cochlea (c) Eardrum (d) Semicircular canals 133. The fluid present in the semicircular canals of the internal ear of human is (a) Endolymph (b) Perilymph (c) Lymph (d) Coelomic fluid 134. Identify A, B, C, D, E, F and G in the given figure. G F A E B D C (a) A–Scala vestibuli, B–Tectorial membrane, C–Scala tympani, D–Basilar membrane, E–Organ of corti, F–Scala media, G–Reissner’s membrane (b) A–Scala tympani, B–Reissner’s membrane, C–Scala vestibuli, D–Basilar membrane, E–Scala media, F–Organ of corti, G–Tectorial membrane (c) A–Reissner’s membrane, B–Tectorial membrane, C–Scala media, D–Organ of corti, E–Scala vestibuli, F–Scala tympani, G–Basilar membrane (d) A–Tectorial membrane, B–Scala tympani, C–Reissner’s membrane, D–Basilar membrane, E–Scala vestibuli, F–Scala vestibuli, G–Organ of corti 135. Which one of the following is not a part of ear? (a) Eustachian tube (b) Cone cell (c) Utriculus (d) Sacculus Neural Control and Co-ordination21.15 136. The base of semicircular canals is swollen and is called _________ which contain a projecting ridges called _________ which ahs hair cells. (a) Papilla, macula ampullaris (b) Ampulla, crista ampullaris (c) Ampulla, macula ampullaris (d) Macula, crista ampullaris 137. Otolith organ consist of (a) Saccule (b) Utricle (c) Semicircular canal (d) Both (a) and (c) 138. Select the correct statement: (a) Neural system co-ordinates and integrates functions as well as metabolic and homeostatic activities of all organs (b) Chemical involved in the transmission of impulse at chemical synapses are always proteins (c) The electrical potential difference across the resting neural membrane is called the action potential (d) Organ of Corti influenced by gravity and movement and helps in maintaining balance of the body and posture Assertion and Reason Questions Read the assertion and reason carefully to mark the correct option out of the options given below: (a) If both the assertion and the reason are true and the reason is a correct explanation of the assertion. (b) If both the assertion and reason are true but the reason is not a correct explanation of the assertion. (c) If the assertion is true but the reason is false. (d) If both the assertion and reason are false. 139. Assertion: The sensation of different colours are produced by various combinations of five types of cones found in our eyes. Reason: Cones are responsible for vision in dim light. 140. Assertion: Nerve impulse can never be transmitted from dendrite or cell body of one neuron to the axon of the next neuron, across a synapse. Reason: This happens because of the synaptic delay at each synapse. 141. Assertion: After hearing a sound, the nerve impulse passes from neurons to the brain. Reason: The neurons which pass nerve impulses from the body organ to the brain is called afferent neuron. 142. Assertion: Cerebrospinal fluid is present throughout the central nervous system. Reason: CSF has no function. 143. Assertion: The cerebellum has very convoluted surface. Reason: It provides additional space for many more neurons. 144. Assertion: Some areas of the brain and spinal cord look white. Reason: This is because cell bodies of neurons are situated in those areas.