  The chiral constituent quark model ($\chi$CQM) has been extended to calculate
the flavor structure of the nucleon through the meson-nucleon sigma terms which
have large contributions from the quark sea and are greatly affected by chiral
symmetry breaking and SU(3) symmetry breaking. The hidden strangeness component
in the nucleon has also been investigated and its significant contribution is
found to be consistent with the recent available experimental observations.
