  In this paper, we investigate the validity of the generalized second law
(GSL) of thermodynamics in flat FRW chameleon cosmology where the boundary of
the universe is assumed to be enclosed by the dynamical apparent horizon. It
has been shown that, in a bouncing scenario for the universe with phantom
crossing, the total entropy decreases with time in the contracting epoch,
whereas, the dynamics of the internal and horizon entropies depends on the
behavior of both equation of state and hubble parameters.
