Page 3 - Assignment-Neural control and coordination

14. Why are grey matter and white matter contained in human nervous system named
so ?

D. Short Answer Questions-I (3 marks each)

15. Observe the diagram given and answer the following questions :
(i) Label the parts A and B.
(ii) Give the function of C and D.
(iii) Name the layers which wrap this organ.

16. What is a synapse ? How does the nerve impulse cross the chemical synapse ?
17. Give the function of the following :
(i) Cerebrum
(ii) Hypothalamus
(iii) Mid brain
18. What is meant by reflex action ? Name the components of a reflex arc in correct
sequence from receptor upto effector. Support your answer by a diagram.
19. Draw a diagram of V. S. of human eye and label the following :
Iris, Ratina, Cornea, Blind spot, Ciliary body and Vitreous chamber.

E. Long Answer Questions (5 marks each)

. 20. Describe in detail, how conduction of nerve impulse takes place through a nerve
fibre.