Which enzyme stimulates the germination of barley seeds?

The first line in the Lyman series has wavelength $\lambda$. The wavelength of the first line in the Balmer series is

The principal section of a glass prism is an isosceles triangle $ABC$ with $AB=AC$. The face $AC$ is silvered. $A$ ray of light is incident normally on the face $AB$ and after two reflections,it emerges from the base $BC$ perpendicular to the base. Angle $BAC$ of the prism is (in $^{\circ}$)

Which of the following metals forms a saline hydride?

Which of the following pairs of ions are colourless?

If the line $ax + by + c = 0$ is a normal to the curve $xy = 1$,then