Fill in the blanks :
(A) Each annual ring corresponds to the growth of ………. of…………. year
(B) Secondary growth helps in increasing the ............... of the roots and stems.
(C) A meristem is a localised region in which actual cell .............. occurs.
(D) The permanent tissues comprise cells which have ........... their capacity of division.
(E) Companion cells are specialised parenchyma cells which are closely associated with the ......... elements
(F) The vascular tissue system is formed by the .............. and ..............

Explanation

(A) wood, one , (B) diameter , (C) division , (D) lost , (E) sieve tube , (F) phloem, xylem.