Complete the statement "The organisms at each trophic level depend on…

The correct answer is Option (4) → Lower trophic level for their energy demands

Option (1) Higher trophic level for their energy demands — Incorrect. Energy flows upwards; each level feeds on the one below it.

Option (2) Lower trophic level for their shelter demands — Incorrect. Trophic levels are about food and energy, not shelter.

Option (3) Higher trophic level for their food demands — Incorrect. Food, like energy, comes from the level below: herbivores eat producers and carnivores eat herbivores. No organism depends on a higher trophic level for its food.

Option (4) Lower trophic level for their energy demands — Correct. Energy flows one way, from the sun to producers and then to consumers. So the organisms at each trophic level depend on those at the lower trophic level for their energy demands.

Note: A similar question was also asked in CUET (UG) 2023 on 13-06-2023 (Slot 3).

NCERT Extract:
Energy Flow – “… The important point to note is that the amount of energy decreases at successive trophic levels. When any organism dies it is converted to detritus or dead biomass that serves as an energy source for decomposers. Organisms at each trophic level depend on those at the lower trophic level for their energy demands.”