Who is known as the Father of Botany?

Among the following compounds,which one is not responsible for the depletion of the ozone layer?

Which of the following oxides does not form an acidic aqueous solution?

$A$ vertical spring with force constant $k$ is fixed on a table. $A$ ball of mass $m$ at a height $h$ above the free upper end of the spring falls vertically on the spring so that the spring is compressed by a distance $d$. The net work done in the process is

If in a $\triangle ABC$,$\frac{1}{a+c} + \frac{1}{b+c} = \frac{3}{a+b+c}$,then $\angle C$ is equal to (in $^{\circ}$)

What is absent in yeast?