Which is false and why?
A) artificial silk is a polysaccharide
B) natural silk is a protein
C) collagen protein forms intercellular ground substance
D) plant proteins are first class proteins.

Dear student.

Option D is false. 

Plant protein is second Class protein or incomplete protein, as they lack one or more amino acids. First class protein are meat, fish, dairy, eggs etc, as they have all the essential amino acid present in them.

Regards.

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