PNP Biasing:

For a pnp transistor, the bias condition is a mirror image of the situation for an npn device, as shown in figure below. The power-supply polarity is reversed. To conquer forward breakover at the E-B junction, an applied signal should have enough negative polarity.

Either the pnp or the npn device can serve as a "current valve." Little changes in the base current I_B persuade large fluctuations in the collector current I_C whenever the device is operated in that area of the characteristic curve where the slope is steep. Whereas the internal atomic activity is different in the pnp device as compared with the npn device, the presentation of the external circuitry is, in most circumstances, alike for practical purposes.

Figure: Typical biasing of a pnp transistor.