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In the ecosystem, there can be multiple food chains, but only a limited number of trophic levels. Based on this statement which of the following is NOT true? A: Each level in the food chain represents one trophic level B: Organisms in the lowest trophic level have the highest population as a lot of energy is available for their survival C: There is a loss of energy as it is being absorbed by organisms at the higher trophic level D: Organisms at the highest trophic level make their own food and do not fully depend on the lower trophic organisms for energy.
A
B
C
D
D
Option D is incorrect because organisms at the highest trophic level (tertiary or quaternary consumers) are heterotrophs that strictly depend on lower trophic levels for their energy intake. They cannot make their own food; only producers (autotrophs) perform photosynthesis or chemosynthesis to convert inorganic energy into organic molecules.
Option D is incorrect because organisms at the highest trophic level (tertiary or quaternary consumers) are heterotrophs that strictly depend on lower trophic levels for their energy intake. They cannot make their own food; only producers (autotrophs) perform photosynthesis or chemosynthesis to convert inorganic energy into organic molecules.
Think of a relay race where every runner must drop 90% of the baton's weight to keep moving; after a few runners, there is nothing left to pass on.
P-H-C-T: Producers, Herbivores, Carnivores, Top-predators.
En+1тАЛ=EnтАЛ├Ч0.10 тАФ representing the 10% energy transfer law between trophic level n and n+1.
Energy flow in an ecosystem follows the 10% Law, where only about 10% of the energy at one trophic level is transferred to the next level. Because of this massive energy loss (roughly 90% per step) in the form of heat and metabolic work, there is insufficient energy to support a large number of trophic levels beyond 4 or 5.
Energy flow is unidirectional in an ecosystem.
Producers form the base of all food chains.
The loss of energy at each transfer limits the length of food chains.
Higher trophic level organisms are entirely dependent on primary producers for their initial energy source.
Conservation biology to track energy loss.
Agricultural planning for biomass efficiency.
The 10% law was proposed by Raymond Lindeman.
Option A is true: Each link in a chain is a trophic level.
Option B is true: Pyramid of numbers usually shows the base has the most individuals.
Option C is true: Energy is lost as heat during respiration and movement.
D is correct тАФ Organisms at the highest trophic level are heterotrophs and are entirely dependent on lower trophic levels for energy.
Always remember that in ecology, energy flows but nutrients cycle; this distinction is frequently tested in competitive exams.
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