$A$ person is having problems with calcium and phosphorus metabolism in his body. Which one of the following glands may not be functioning properly?

Haploids are more suitable for mutation studies than diploids. This is because

Two polaroids are placed in the path of an unpolarized beam of intensity $I_0$ such that no light is emitted from the second polaroid. If a third polaroid,whose polarization axis makes an angle $\theta$ with the polarization axis of the first polaroid,is placed between these polaroids,then the intensity of light emerging from the last polaroid will be:

Which of the following substances is obtained from the fungus $Claviceps$ $\text{purpurea}$ (ergot)?

$A$ wire fixed at the upper end stretches by length $l$ by applying a force $F$. The work done in stretching is

When light of wavelength $\lambda$ is incident on a photosensitive surface,photons of power $P$ are emitted. The number of photons $n$ emitted in $t$ seconds is (where $h$ = Planck's constant,$c$ = velocity of light in vacuum).