$A$ solid reflects incident light and its electrical conductivity decreases with temperature. The binding in this solid is

How are holes produced in a semiconductor?

In semiconductors at room temperature,

The electrical conductivities of $Ge$ and $Na$ are $\sigma_1$ and $\sigma_2$ respectively. If these materials are heated,then:

How does an intrinsic semiconductor behave at $0 \ K$?

This question has Statement $1$ and Statement $2$. Of the four choices given after the Statements,choose the one that best describes the two Statements.
Statement $1$ : $A$ pure semiconductor has a negative temperature coefficient of resistance.
Statement $2$ : On raising the temperature,more charge carriers are released into the conduction band.