DEPARTMENT OF BIOLOGY

CLASS-X(Chapter wise worksheet)

Nervous System

Question 1: Name the following

  1. The ear ossicle which is attached to tympanum.
  2. The neurotransmitter in human beings.
  3. The gap between dendrites of one neuron and axon endings of other neurons.
  4. The part of the brain that controls involuntary actions like breathing and heart beat.
  5. The part of eye which alters the shape of the lens.
  6. The ability of eye to focus on object in darkness and brightness.
  7. The protective covering of the brain and spinal cord.
  8. Eye defect caused due to shortening of eyeball from front to back.
  9. Eye defect in which person cannot see near objects clearly.
  10. The region of distinct vision in the eye.
  11. The ear ossicle in contact with the oval window.
  12. A quick involuntary action in response to the stimulus.
  13. A sensory structure in cochlea which helps in hearing.
  14. The part of the ear which maintains dynamic balance of the body.
  15. The part of the ear which maintains static balance of the body.
  16. The collective term for Malleus, Incus and stapes.
  17. The cells in the retina sensitive to bright light.
  18. The structure present in ear which converts sound waves into vibrations
  19. The ability of eye to focus on object at different distances.
  20. Nerve which transmit impulses from ear to brain.

Question 2: Give exact location of the following structures

  1. Meninges
  2. Cerebrospinal fluid
  3. Yellow spot
  4. Organ of corti
  5. Cerebellum
  6. Aqueous chamber
  7. Vitreous chamber
  8. Ear Ossicle
  9. Myelin sheath
  10. Lacrimal gland

Question 3: Write one important function of the following

  1. Ciliary muscles.
  2. Ear ossicles.
  3. Iris of the eye
  4. Meninges
  5. Corpus callosum
  6. Pons
  7. Medulla oblongata
  8. Cerebellum
  9. Neurotransmitter
  10. Yellow spot
  11. Cochlea
  12. Semicircular canal
  13. Eustachian tube
  14. Ear ossicle
  15. Inter neuron

Question 4: Write the differences between the following based on what is mentioned in the bracket.

  1. Fovea centralis and Fenestra ovalis (location)
  2. Myopia and Hyperopia (shape of the lens)
  3. Sensory neuron and motor neuron( function)
  4. Cerebrum and Spinal cord(arrangement of neurons)
  5. Rods and Cones(pigment)
  6. Cranial nerves and Spinal nerves(Number)
  7. Yellow spot and Blind Spot(photosensitive cells)
  8. Myopia and Hypermetropia( cause and correction)
  9. Optic nerve and Auditory nerve (function)
  10. Power of accommodation and Power of adaptation(definition)
  11. Cerebellum and Cerebrum(function)
  12. Natural reflex and conditional reflex.( definition)

Question 5:

Given below are fivesets of terms. In each case, arrange and rewrite each set

so as to be in logical sequence.

  1. Tympanum, stapes, malleus, incus, fenestra ovalis.
  2. Association neuron, effector, motor neuron, receptor, sensory neuron.
  3. Lens, pupil, conjunctiva, yellow spot, cornea.
  4. Soma, axon terminal, impulse, dendrites, axon .

Question 6: The following diagram shows cross-section of spinal cord.Study it carefully and answer the following questions:

i.What do the arrows indicate?

ii.What is the name of the path taken by the nerves?

iii.Label the parts numbered from 1 to 10.

iv.Is spinal nerve sensory, motor or mixed? How many pairs of spinal nerves are present in humans?

v. How is the arrangement of neurons in spinal cord ?

Question 6: The following diagram shows human brain. Study it carefully and answer the following questions:

i.Label the part numbered A,B and C.

ii.Mention one important function of each of the parts numbered A,B and C.

iii. Name the basic unit of brain.

iv.What handicap would result from :

1.damage to part s numbered B and C

Question 7: The diagram below represents a certain defects of vision of the human eye. Observe it carefully and answer the following questions.

i.Name the defect.

ii.Describe briefly the condition in the eye

responsible for the defect.

iii.Redraw the figure by adding the suitable lens correcting the defect.

iv.What special advantage do human beings derive in having both eyes facing forward?

Question 8: Draw a diagram of human eye as seen in vertical section and label the parts which suits the following descriptions relating to the :

i, photosensitive layer of the eye.

ii. Structure which maintains the shape of the eyeball.

iii. Outermost transparent layer seen in front of the eye ball.

iv. Area of best vision

v. Structure which is responsible for holding the eye lens in its position.

Question 9: The following diagram shows human ear. Study it carefully and answer the following questions:

i.Label the parts numbered 1to 10.

ii.Write one important function of the part numbered 4,5 ,6 and 8.

iii.What is the collective term used for part 1, 2 and 3?

iv.Name the part that connects the cavity of middle ear to the throat.

v. Which part of the ear is concerned with static balance in human beings?