Neural Control And Coordination Multiple Choice Questions

Q1. The receptor absent in the tongue is

  • Thermoreceptor  
  • Gustatoreceptor  
  • Photoreceptor  
  • None of the above  

Solution

Thermoreceptors (for temperature) and gustatoreceptors (for taste) are present in the tongue. Photoreceptors (for light) are present in the eye but absent in the tongue.

Q2. Eye lens focuses light on the retina containing rod cells which are photoreceptors. The number of rod cells in the eyes is

  • 120 million
  • 160 million
  • 150 million
  • 180 million

Solution

The total number of rod cells in the human retina has been estimated at 110-125 million.

Q3. Pinna is a part of

  • Inner ear
  • Middle ear
  • External ear
  • Tongue

Solution

Pinna is a part of the external ear which collects sound waves

Q4. The wax gland present in the ear canal is called

  • Sweat gland
  • Prostate gland
  • Cowper’s gland
  • Sebaceous gland/ceruminous gland

Solution

Wax glands present in the ear canal are called sebaceous glands or ceruminous glands. They secrete a brownish, semisolid, fatty substance called wax or cerumen.

Q5. Retina is most sensitive at

  • Optic disc
  • Periphery
  • Macula lutea
  • Fovea centralis

Solution

Macula lutea is a small area on the retina which lies opposite to the optical axis of the lens. It has a depression (the fovea centralis) in the middle. It is the area of most distinct day vision.

Q6. Stapes transmits the hearing vibrations to

  • Auditory canal
  • Oval window
  • Ear drum
  • Cochlea

Solution

Stapes transmits vibrations to the membrane of the oval window

Q7. One end of each semi-circular canal is widened to form: 

  • Sacculus
  • Utriculus
  • Ampulla
  • Cochlear base

Solution

Ends of the semicircular canals widen to form an ampulla. 

Q8. Which of the following nerves is purely a motor nerve?

  • Vagus  
  • Facial  
  • Abducens  
  • Trigeminal  

Solution

Abducens is a motor nerve which controls the movement of the eyeball. Vagus, facial and trigeminal are mixed nerves.

Q9. The sequence of ear ossicles from the outside to inside is

  • Malleus Error! Filename not specified. incus Error! Filename not specified. stapes
  • Incus Error! Filename not specified. stapes Error! Filename not specified. malleus
  • Stapes Error! Filename not specified. incus Error! Filename not specified. malleus
  • Malleus Error! Filename not specified. stapes Error! Filename not specified. incus

Solution

The sequence of ear ossicles from outside to inside is Malleus Error! Filename not specified. incus Error! Filename not specified. stapes.

Human ear bones or ossicles are incus, malleus and stapes. The outer ossicle is hammer-shaped and is called the malleus. The inner ossicle is stirrup-shaped and is called the stapes. The middle ossicle is anvil-shaped and is called the incus.

Q10. The normal hearing range for humans is ____________ Hz.

  • 10 , 000 to 15,000 Hz
  • 100 to 150 Hz
  • 20 to 20,000 Hz
  • 200 to 250 Hz

Solution

The normal hearing range for humans is 20 to 20,000 Hz.

Q11. The middle ear consists of

  • Ear ossicles and eustachian tube
  • Eustachian tube and tympanum
  • Ear ossicles and tympanum
  • Tympanum, Eustachian tube and ear ossicles

Solution

Middle ear contains ear ossicles and eustachian tube

Q12. Which of the following ossicles is connected to ear drum?

  • Utriculus
  • Malleus
  • Stapes
  • Incus

Solution

Of the three bones of the ear ossicles, malleus is the first towards the outer ear and is in contact with the ear drum. 

Q13. An action potential in the nerve fibre is produced when positive and negative charges on the outside and the inside of the axon membrane are reversed because

  • more potassium ions enter the axon as compared to sodium ions leaving it
  • more sodium ions enter the axon as compared to potassium ions leaving it
  • all potassium ions leave the axon
  • all sodium ions enter the axon

Solution

When a nerve fibre is stimulated, its membrane becomes more permeable to sodium ions. Hence, more sodium ions enter the axon than potassium ions leaving it. As a result, the positive and negative charges on the outside and inside of the membrane are reversed.

Q14.

In mammals, the brain centre which regulates body temperature is situated in the

  • Cerebellum
  • Cerebral lobe
  • Hypothalamus
  • Medulla oblongata

Solution

In mammals, the hypothalamus maintains homeostasis, i.e. it regulates body temperature.

Q15. Which part of the brain controls intellectual ability?

  • Frontal lobe
  • Parietal lobe
  • Temporal lobe
  • Occipital lobe

Solution

In the frontal lobe of the cerebral hemisphere, thoughts and actions are monitored and creative ideas occur, so it controls all intellectual ability.

Q16. The human hindbrain comprises three parts, one of which is the

  • Spinal cord
  • Corpus callosum
  • Cerebellum
  • Hypothalamus

Solution

Cerebellum, pons and medulla oblongata are the three parts of the hindbrain.

Q17. The sense of smell is perceived by

  • Pituitary
  • Hypothalamus
  • Olfactory lobe
  • Cerebrum

Solution

The anterior part of the brain is formed by a pair of short club-shaped structures, the olfactory lobes. Olfactory lobes are concerned with the sense of smell.

Q18. Acute vision is present in

  • Vulture
  • Shark
  • Bat
  • Frog

Solution

Acute vision is found in birds like vulture.

Q19. Which one of the following does not act as a neurotransmitter?

  • Cortisone  
  • Acetylcholine  
  • Epinephrine  
  • Norepinephrine  

Solution

Cortisone is a hormone released by the adrenal glands.

Q20. The satiety centre of the brain is present in the

  • Cerebral hemisphere  
  • Hypothalamus  
  • Cerebellum  
  • Medulla oblongata  

Solution

The centre of satiety, i.e. the feeling of being satisfied, is present in the hypothalamus of the brain.

Q21. The sensitive pigmented layer of the eye is

  • Cornea
  • Retina
  • Sclerotic
  • Iris

Solution

The retina consists of a pigmented layer and a nervous tissue layer.

Q22. The organ of Corti is a structure present in the

  • External ear
  • Middle ear
  • Semicircular canal
  • Cochlea

Solution

The organ of Corti is a structure present in the cochlea on its basilar membrane.

Q23. _______________ connects the cavity of the middle ear to the throat

  • Auditory canal
  • Semicircular canal
  • Ampulla
  • Eustachian tube

Solution

Eustachian tube connects the cavity of the middle ear to the throat

Q24. Which of the following equalizes air pressure on either sides of ear drum?

  • Pinna
  • Round window
  • Eustachian tube
  • Oval window

Solution

Eustachian tube equalizes air pressure in the sides of ear drum

Q25. Which of the cells are phagocytic as well as scavengers?

  • Astrocytes  
  • Neurons  
  • Oligodendrocytes  
  • Microglia  

Solution

Astrocytes, oligodendrocytes and microglia are three types of neuroglia. Astrocytes provide mechanical support to the neurons. Oligodendrocytes form myelin sheaths around the axon and microglia are phagocytic and scavengers. They engulf microbes and cellular debris.

Q26. Telescopic vision is found in

  • Birds
  • Dog
  • Rabbit
  • Frog

Solution

Telescopic vision is found in birds, i.e. they have the ability to see distant objects clearly.

Q27. Nodes of Ranvier are found in

  • Non-myelinated nerve fibres  
  • Myelinated nerve fibres  
  • Both 1 and 2 above  
  • None of the above  

Solution

Nodes of Ranvier are found in myelinated nerve fibres. These are the gaps between two adjacent myelin sheaths.

Q28. The 5th cranial nerve of frog is called

  • Optic nerve  
  • Vagus  
  • Trigeminal  
  • Ophthalmic  

Solution

The 5th cranial nerve of frog is called the trigeminal nerve. It is the largest cranial nerve arising from the medulla oblongata.

Q29. How many pairs of spinal nerves are there in man?

  • 10
  • 21
  • 15
  • 31

Solution

There are 31 pairs of spinal nerves in man. These are classified into five groups:

  1. Cervical nerves – 8 pairs
  2. Thoracic nerves – 12 pairs
  3. Lumbar nerves – 5 pairs
  4. Sacral nerves – 5 pairs
  5. Coccygeal – 1 pair

Q30. Which part of the nervous system controls the reflex activity of the body?

  • Vermis
  • Pons
  • Spinal cord
  • Corpus callosum

Solution

The spinal cord controls the reflex activity of the body as it is a spontaneous automatic response to a stimulus. So, it reduces the work load of the brain.

Q31. The primitive nervous system is formed in

  • Sponge  
  • Cnidaria  
  • Echinodermata  
  • Annelida  

Solution

The primitive nervous system is formed in Cnidaria and consists of nerve cells and fibres throughout the body.

Q32. Mark the vitamin present in Rhodopsin

  • Vitamin A
  • Vitamin B
  • Vitamin C
  • Vitamin D

Solution

Rhodopsin, a visual purple pigment, is a derivative of vitamin A.

Q33. The reflex arc consists of

  • Motor nerve
  • Sensory nerve
  • Both of the above
  • None of the above

Solution

The reflex arc consists of both sensory nerve and motor nerve. The sensory nerve conducts the sensory impulse from the receptor organ to the spinal cord. The motor nerve conducts the motor nerve impulse from the spinal cord to the effectors.

Q34. Which of the following is not a reflex action?

  • Blinking of eyes
  • Salivation
  • Sweating
  • Withdrawal of hand on touching some hot object

Solution

Sweating is the secretion of sweat from the sweat glands to regulate body temperature. It is not a reflex action. Blinking of eyes, salivation and withdrawal of the hand on touching some hot object are examples of reflex actions as they involve the rapid, automatic and involuntary response to a stimulus.

Q35. In sensineural hearing impairment ____________ gets damaged.

  • Cochlea
  • Ear Ossicles
  • Auditory Nerve
  • Both (A) and (C)

Solution

In sensineural hearing impairment both the cochlea and the auditory nerve gets damaged.

Q36. The part of the brain concerned with muscular movements is

  • Cerebellum
  • Thalamus
  • Hippocampus
  • Temporal lobe of cerebrum

Solution

The cerebellum controls rapid muscular activities such as walking, running, typing, jogging etc.

Q37. The pigment iodopsin is contained in

  • Rod cells
  • Cone cells
  • Amacrine cells
  • Horizontal cells

Solution

Cone cells contain a visual violet pigment called iodopsin which is sensitive to bright day light.

Q38. Which one feature is common to leech, cockroach and scorpion?

  • Nephridia  
  • Ventral nerve cord  
  • Cephalisation  
  • Antennae  

Solution

The central nervous system of leech, cockroach and scorpion has a double, ventral and solid nerve cord.

Q39. Colour blindness is due to a defect in

  • Cones  
  • Rods  
  • Rods and cones  
  • Rhodopsin  

Solution

Colour blindness is the inability to see colours. Lack of one or more types of cone cells causes colour blindness.

Q40. Iris is part of

  • Sclerotic
  • Choroid
  • Choroid and retina
  • Sclerotic and choroid

Solution

The iris consists of two layers—outer one in continuation with the choroid and inner one in continuation with the retina.