What is the small,circular $DNA$ molecule present in a bacterial cell,in addition to the main genomic $DNA$,called?

The scientist who classified plants based on their habitat is .........

The anode voltage of a photocell is kept fixed. The wavelength $\lambda$ of the light falling on the cathode is gradually changed. The plate current $I$ of the photocell varies as follows:

Which organ in an adult human causes the least damage if removed?

Which option is correct to match section $A$ with section $B$?

If $\theta = \frac{\pi}{6}$,then the $10^{\text{th}}$ term of the series $1 + (\cos \theta + i \sin \theta)^1 + (\cos \theta + i \sin \theta)^2 + \dots$ is