A) Cell wall of algae is made of cellulose, galactons mannans and minerals like \[CaC{{O}_{3}}\]
B) In plants, cell wall consists of cellulose, hemicellulose, pectins & proteins
C) The middle lamella is a layer mainly of calcium pectate
D) The pili are elongated tubular structures made of a special protein called pilum
Correct Answer: D
Solution :
[d] The pili are elongated tubular structures made of a special protein called pilum The pili (sing pilus) are elongated tubular structure made of special protein called pilin.
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