Question:
Fill in the blanks :
(a) Cork cells possess on …………….. their walls that makes them impervious to gases and water.
(b) ……………. have tubular cells with perforated walls and are living in nature.
(c) Bone possesses a hard matrix composed of …………….. and ……………
Solution:
a -suberin,
b-sieve tubes,
c-calcium, phosphorus.