What is the final product obtained by the reduction of glycerol with hydriodic acid $(HI)$?

Which of the following shows the correct chronological order of the events occurring during callus culture?

Mosses and ferns are found in moist and shady places because both

Emulsification of $10 \, mL$ of oil in water produces $24 \times 10^{18}$ droplets. If the surface tension at the oil-water interface is $0.03 \, J \, m^{-2}$ and the area of each droplet is $12.5 \times 10^{-16} \, m^2$,the energy spent in the formation of oil droplets is $.... \, J$.

In a reaction of $C_6H_5Y$,the major product $(> 60\%)$ is $m$-isomer,so the group $Y$ is:

$A$ galvanometer of resistance $G$ is connected in a circuit. Now,a resistance $R$ is connected in series with the galvanometer. To keep the main current in the circuit unchanged,the resistance $S$ to be put in parallel with the series combination of $G$ and $R$ is: