The $Pusa$ $Komal$ variety of cowpea,which was developed by hybridization and selection,is primarily resistant to which of the following?

The current in an $LR$ circuit builds up to $\frac{3}{4}$ of its steady-state value in $4 \ s$. The time constant of this circuit is:

Dry air is passed through a solution containing $10 \ g$ of solute and $90 \ g$ of water,and then it is passed through pure water. The loss in weight of the solution is $2.5 \ g$ and the loss in weight of the pure solvent is $0.05 \ g$. Calculate the molecular weight of the solute.

Consider the following reaction: $N_{2(g)} + 3H_{2(g)} \longrightarrow 2NH_{3(g)}$. The rate of this reaction in terms of $N_2$ at $T \ K$ is $-\frac{d[N_2]}{dt} = 0.02 \ mol \ L^{-1} \ s^{-1}$. What is the value of $-\frac{d[H_2]}{dt}$ (in units of $mol \ L^{-1} \ s^{-1}$) at the same temperature?

The first biosphere reserve established in India for conserving the gene pool of flora and fauna and the lifestyle of tribals is

If $x > 0$ and $x^y = e^{x-y}$,then $\frac{dy}{dx}$ is equal to