Fill in the blanks
(a) Cork cells possess ___ on their walls that makes it 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 ___.
(b) Sieve tubes
(c) Calcium and phosphorus
a) Suberin- An impermeable waxy substance present in the cell walls and a major constituent of cork.
b) Sieve tubes with perforated end walls