Question

The direction of energy flow is
Producer -> Herbivores -> Decomposers -> Omnivores
Producer -> Carnivore -> Herbivore -> Decomposers
Decomposers -> Carnivores -> Herbivores -> Producers
Producers -> Herbivores -> carnivores -> Decomposers

Answer 1

Hint: The energy flow starts from the lower trophic level to the higher trophic level. This flow of energy is unidirectional.

Step by step answer:The trophic levels of a food chain are – primary trophic level, secondary trophic level, tertiary trophic level, and quaternary trophic level. The energy flow is always unidirectional.
The primary trophic level includes the producers – the trees, the phytoplankton that help in the production of food which is then taken up by all other living beings.
The secondary trophic level includes the animals that only consume trees, herbs – known as the herbivores.
The tertiary and quaternary trophic levels only include the carnivore and omnivore animals respectively. The carnivore animals eat only the flesh of herbivore animals and omnivore animals eat all kinds of food – herbs, as well as flesh.
Decomposers do not include in any trophic level. They can take energy from any trophic level after the death of the animals.
So, the correct answer is option D. Producers -> Herbivores -> carnivores -> Decomposers.

Note: The energy flow of the organisms follows the 10 % rule. It means only 10 % of energy is transferred from one trophic level to the next level. For example, if the producers produce 100 cal energy, only 10 cal energy will be transferred to the next level. From that level, only 1 cal energy will be transferred to the next level and the final level will get only 0.1 % of energy.