What is common between vegetative reproduction and apomixis?

The perpendicular distance from the point $(1, \pi)$ to the line joining $(1, 0^{\circ})$ and $(1, \frac{\pi}{2})$ (in polar coordinates) is:

The eccentricity of the ellipse $9x^2 + 5y^2 - 30y = 0$ is

During transcription,the site on $DNA$ where $RNA$ polymerase binds is called .........

If $(2,-1,3)$ is the foot of the perpendicular drawn from the origin to the plane, then the equation of the plane is

$A$ reversible engine converts one-sixth of the heat supplied into work. When the temperature of the sink is reduced by $62^{\circ} C$,the efficiency of the engine is doubled. The temperatures of the source and sink are