  The properties of ground-state baryons of light-quarks are investigated in
U(12)-classification scheme of hadrons, recently proposed by us. In U(12), in
addition to the ordinary 56 of SU(6)SF, the existence of the extra 56 with
positive-parity and 70 with negative-parity appear as ground-states in lower
mass region. The N(1440), Lambda(1600) and Sigma(1660) have the plausible
properties of masses and strong decay widths as the flavor-octet of extra 56,
while the ordinary radially-excited octet states are expected not to be
observed as resonances because of their large predicted widths of the decays to
extra 70 baryons. The extra 70 baryons are not observed directly as resonances
for the same reason, except for only the Lambda(1406), of which properties are
consistently explained through the singlet-octet mixing. The baryon properties
in lower mass regions are consistently explained in U(12) scheme.
