Which of the following is a level of biological organization?

Which one of the following concerns Photophosphorylation?

In the $C.G.S.$ system,the magnitude of the force is $100 \ dynes$. In another system where the fundamental physical quantities are $kilogram$,$metre$,and $minute$,the magnitude of the force is:

Radial symmetry is observed in:

When orthoboric acid is heated,the residue left is ...

If $\sin A + \sin B = \sqrt{3}(\cos B - \cos A)$,then $\sin 3A + \sin 3B$ is equal to: