The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals include the:

In which of the following is the gametophytic phase reduced,short-lived,and limited to the formation of gametes?

Among the following pairs of complexes,in which case is the $\Delta_0$ value higher for the first one than the second?

$A$ rifle of $20 ~kg$ mass can fire $4$ bullets per second. The mass of each bullet is $35 \times 10^{-3} ~kg$ and its final velocity is $400 ~ms^{-1}$. What force must be applied on the rifle so that it does not move backwards while firing the bullets (in $~N$)?

An $LCR$ series circuit with a resistance of $100\,\Omega$ is connected to an ac source of $200\,V$ (r.m.s.) and angular frequency $300\,rad/s$. When only the capacitor is removed,the current lags behind the voltage by $60^\circ$. When only the inductor is removed,the current leads the voltage by $60^\circ$. The average power dissipated is......$W$.

What is the gas liberated when alkaline formaldehyde solution is treated with $H_2O_2$?