  Transition-metal dichalcogenides (WTe$_2$ and MoTe$_2$) have drawn much
attention, recently, because of the nonsaturating extremely large
magnetoresistance (XMR) observed in these compounds in addition to the
predictions of likely type-II Weyl semimetals. Contrary to the topological
insulators or Dirac semimetals where XMR is linearly dependent on the field, in
WTe$_2$ and MoTe$_2$ the XMR is nonlinearly dependent on the field, suggesting
an entirely different mechanism. Electron-hole compensation has been proposed
as a mechanism of this nonsaturating XMR in WTe$_2$, while it is yet to be
clear in the case of MoTe$_2$ which has an identical crystal structure of
WTe$_2$ at low temperatures. In this paper, we report low-energy electronic
structure and Fermi surface topology of MoTe$_2$ using angle-resolved
photoemission spectrometry (ARPES) technique and first-principle calculations,
and compare them with that of WTe$_2$ to understand the mechanism of XMR. Our
measurements demonstrate that MoTe$_2$ is an uncompensated semimetal, contrary
to WTe$_2$ in which compensated electron-hole pockets have been identified,
ruling out the applicability of charge compensation theory for the
nonsaturating XMR in MoTe$_2$. In this context, we also discuss the
applicability of the existing other conjectures on the XMR of these compounds.
