Which of the following is $NOT$ a mode of nutrition?

The relative reactivities of acyl compounds towards nucleophilic substitution are in the order of

If the angle between the lines joining the origin to the points of intersection of $x+2y+\lambda=0$ and $2x^2-2xy+3y^2+2x-y-1=0$ is $\frac{\pi}{2}$,then a value of $\lambda$ is

Which of the following biomolecules acts as specific catalysts in biological reactions?

The truth table for the system of four $NAND$ gates as shown in the figure is:

Two rods of same material have same length and area. The heat $\Delta Q$ flows through them for $12 \, \text{minutes}$ when they are joined in series. If now both the rods are joined in parallel,then the same amount of heat $\Delta Q$ will flow in ........ $\text{minutes}$.