In angiosperms,the functional megaspore develops into which of the following?

$A$ coil of area $80\, cm^2$ and $50\, turns$ is rotating with $2000$ revolutions per minute about an axis perpendicular to a magnetic field of $0.05\, T$. The maximum value of the $emf$ developed in it is

Two bodies $A$ and $B$ start from the same point at the same instant and move along a straight line. $A$ moves with uniform acceleration $a$ and $B$ moves with uniform velocity $V$. They meet after time $t$. The value of $t$ is:

An $X$-ray tube is operated at $50 \ kV$. The minimum wavelength produced is ..... $\mathring{A}$.

The $9^{th}$ pair of cranial nerves in a frog is:

Which one of the following is a correct pair with respect to the molecular formula of a xenon compound and the hybridization state of xenon in it?