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Question 46
Fill in the blanks
(a) Cork cells possess ___ o
n 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 ___.

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Solution

(a) Suberin
(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

c) Bone

  1. Bone is made mostly of collagen, a protein that is woven into a flexible framework.
  2. Bone also contains calcium phosphate and calcium carbonate, minerals that add strength and harden the framework.
  3. The combination of calcium and collagen gives the bone its strength and flexibility.

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