$A$ storehouse of collected plant specimens that are dried,pressed,and preserved on sheets is known as .........

The metal used for the de-bromination reaction of $1, 2-dibromoethane$ is:

In which of the genetic disorders does an individual exhibit overall masculine development,gynaecomastia,and sterility?

If $\alpha, \beta$ and $\gamma$ are the roots of the equation $x^3+p x^2+q x+r=0$,then the coefficient of $x$ in the cubic equation whose roots are $\alpha(\beta+\gamma), \beta(\gamma+\alpha)$ and $\gamma(\alpha+\beta)$ is

Charges $+q$ and $-q$ are placed at points $A$ and $B$ respectively,which are at a distance $2L$ apart. $C$ is the midpoint between $A$ and $B$. The work done in moving a charge $+Q$ along the semicircle $CRD$ is:

The enzyme enterokinase helps in the conversion of $............$.