  The role of nonvalence, {\it e.g.} sea quarks and/or meson degrees of freedom
in static and quasistatic baryon electroweak observables, is discussed within
the phenomenological sum rule approach. The inclusion of nonvalence degrees of
freedom in the analysis of baryon magnetic moments explains extremely strong
violation of the standard SU(6) symmetry-based quark-model prediction for the
magnetic moment ratio $R_{\Sigma /\Lambda}=(\Sigma^{+} +
2\Sigma^{-})/(-\Lambda) \simeq .23$, while the value $R_{\Sigma
/\Lambda}(SU(6))= 1$ corresponds to the nonrelativistic quark model. We also
obtain $F/D=.72$ for the quark-current-baryon coupling $SU(3)_{f}$ ratio. The
implications for the "strangeness" magnetism of the nucleon and for weak
axial-to-vector coupling constant relations measured in the lowest octet baryon
$\beta$-decays are discussed. The latter shows up the possible role of the
induced second-class form factor (the "weak- electricity", or pseudotensor form
factor) in the extraction of the $(g_1/f_1)$-values from the hyperon's
$\beta$-decay data.
