The ultimate source of energy in the biosphere is

Identify the incorrect statement regarding the flow of energy between various components of the food chain.

If the biomass of a lion in a food chain is $10 \ kg$,then the biomass of the producers is approximately ...... $kg$.

In an ecosystem,if the Net Primary Productivity $(NPP)$ of the first trophic level is $100x \text{ kcal } m^{-2} yr^{-1}$,what would be the Gross Primary Productivity $(GPP)$ of the third trophic level of the same ecosystem?

The driving force of any ecosystem is

Assertion $A$: The amount of free energy in a system gradually decreases.
Reason $R$: During any transformation of energy,some amount of energy is lost in the form of heat.
Which option is correct for Assertion $A$ and Reason $R$?