S1. The smoke of a devastating forest fire always carries two compounds, with it, a life promoter, and a regulator.
P. The forest fires have a role to play in maintaining a balance in nature.
Q. After forest fires have been extinguished, the seeds that abound on forest
floors take over to repopulate the burnt forest.
R. The regulatory chemical in the smoke keeps a check on these seeds and lets them
germinate only when there is enough moisture in the atmosphere again.
S4. Once the seeds have germinated the promoter chemical takes over to ensure a rapid re‐growth of the forest.