A) Na
B) Ca
C) K
D) Mg
Correct Answer: B
Solution :
Chemical composition of the cell wall is the following: (a) Matrix water?60%, hemicellulose? 5-15%, pectic substance?2-8%, Lipids? 0.5-3.0%, proteins?1-2%. (b) Microfibrils Cellulose/fungus cellulose? 10-15%. (c) Other Ingredients lignin, cutin, suberin, silica, minerals (.e.g., iron, calcium, carbonate) waxes, tannins, resins, gum etc
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