Which of the following is an ecological energy source?

Assertion $A$: Heat energy is available for the functioning of a system.
Reason $R$: Some amount of energy is lost during energy transformation.
Which option is correct for Assertion $A$ and Reason $R$?

The number of individuals in each trophic level depends upon

Cybernetics is associated with

At which of the following levels is the energy the lowest?

The first link in any food chain is always a green plant because