Statement - I :Pleated sheet structure of protein shows maximum extension
Statement - II :Intermolecular hydrogen bonding is present in them

Due to hydrogen bonding interactions between adjacent amino acid residues the polypeptide chain can arrange itself into a proper helical or pleated segments. These segments make up to the  structural conformities, so-called regular structures that extend along one dimension, like the coils of a spring. They have a proper orientation.