Which type of primary xylem is present in the given figure?

In a haplontic life cycle,how many of the four haploid nuclei degenerate?

If the magnetic dipole moment of an atom of diamagnetic material,paramagnetic material and ferromagnetic material are denoted by $\mu_d$,$\mu_p$ and $\mu_f$ respectively,then

The correct order of the $O-O$ bond length in $O_2$,$H_2O_2$ and $O_3$ is

If $f(x) = x^3 - 10x^2 + 200x - 10$,then

$A$ body weighs $700 \, gm \, wt$ on the surface of the earth. How much will it weigh on the surface of a planet whose mass is $\frac{1}{7}$ and radius is half that of the earth?