To which series does $Catharanthus$ $roseus$ belong?

$A$ paramagnetic sample shows a net magnetization of $8 \ Am^{-1}$ when placed in an external magnetic field of $0.6 \ T$ at a temperature of $4 \ K$. When the same sample is placed in an external magnetic field of $0.2 \ T$ at a temperature of $16 \ K$,the magnetization will be

What are the harmful effects of photochemical smog and how can they be controlled?

$S$ and $T$ are the foci of an ellipse and $B$ is an end point of the minor axis. If $\triangle STB$ is an equilateral triangle,then the eccentricity of the ellipse is:

We consider the radiation emitted by the human body. Which of the following statements is true?

The molecular interactions responsible for hydrogen bonding in $HF$ are: