Which scientists conducted in-depth research in the field of plant classification?

Which of the following is mismatched?

The effect due to a uniform magnetic field on a freely suspended magnetic needle is as follows:

If $C_p$ and $C_v$ denote the specific heats of nitrogen per unit mass at constant pressure and constant volume respectively,then

Consider the circle $x^2+y^2-4x-2y+c=0$ whose centre is $A(2,1)$. If the point $P(10,7)$ is such that the line segment $PA$ meets the circle at $Q$ with $PQ=5$,then $c$ is equal to

The logic circuit shown below has the input waveforms $A$ and $B$ as shown. Pick out the correct output waveform.