  We describe the electroproduction ratios of baryon-meson states from nucleon,
inferring from the sea quarks in the nucleon using an extension of the quark
model that takes into account the sea. As a result we provide, with no
adjustable parameters, the predictions of ratios of exclusive meson-baryon
final states:$\Lambda K^+$, $\Sigma ^{*}K$, $\Sigma K$, $p\pi^0$, and $n\pi^+$.
These predictions are in agreement with the new Jlab experimental data showing
that sea quarks play an important role in the electroproduction. We also
predicted further ratios of exclusive reactions that can be measured and tested
in future experiments. In particular, we suggested new experiments on deuterium
and tritium. Such measurements can provide crucial test of different
predictions concerning the structure of nucleon and its sea quarks helping to
solve an outstanding problem. Finally, we computed the so called strangeness
suppression factor, $\lambda_s$, that is the suppression of strange
quark-antiquarks compared to nonstrange pairs, and we found that our finding
with this simple extension of the quark model is in good agreement with the
results of Jlab and CERN experiments.
