A) cellulose
B) hemicellulose
C) pectin
D) all of these.
Correct Answer: D
Solution :
: In plants, primary cell wall is made up of cellulose ((3-D-glucose units), hemicellulose (arabinose, mannose, xylose, galactose etc.) and pectin (galactose, galacturonic acid and arabinose).
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