Haploid plants are obtained from which of the following?

The frequency for which a $5\,\mu F$ capacitor has a reactance of $\frac{1}{1000}\,\Omega$ is given by

$A$ double slit experiment is immersed in water of refractive index $1.33$. The slit separation is $1 ~mm$ and the distance between the slit and the screen is $1.33 ~m$. The slits are illuminated by light of wavelength $6300 ~Å$. The fringe width is:

The foci of the hyperbola $\frac{x^2}{16} - \frac{(y - 2)^2}{9} = 1$ are

If $|a| = 2$,$|b| = 3$ and $a, b$ are mutually perpendicular,then the area of the triangle whose vertices are $0, a + b, a - b$ is

Which of the following organs is known as the 'blood bank' of the human body?