The polymer having an amide linkage is

$A$ plane $\pi$ makes intercepts $3$ and $4$ respectively on $Z$-axis and $X$-axis. If $\pi$ is parallel to $Y$-axis,then its equation is:

If a force $F$ is applied on a body and it moves with a velocity $v$,the power will be

The population $p(t)$ at time $t$ of a certain mouse species follows the differential equation $\frac{d p(t)}{d t}=0.5 p(t)-450$. If $p(0)=850$, then the time at which the population becomes zero is

Smooth muscles are:

The quantum numbers $+1/2$ and $-1/2$ for the electron spin represent