  The ratio of the low-energy absorption cross section for Dirac fermion to
that for minimally coupled scalar is computed when the spacetimes are various
types of the higher-dimensional Reissner-Nordstr\"{o}m black holes. It is found
that the low-energy absorption cross sections for the Dirac fermion always goes
to zero in the extremal limit regardless of the detailed geometry of the
spacetime. The physical importance of our results is discussed in the context
of the brane-world scenarios and string theories.
