Answer:
(d)
According to 10% law, only 10% of the energy entering a particular trophic
level of organisms is available for transfer to the next higher trophic level.
In this food chain, at the 4th trophic level, only 5 RJ energy is available to
the snake, So, the energy availableat the producer level will be 5000 kJ. It
can be shown as
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