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In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is 100x (kcal m⁻²) yr⁻¹, what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem?
According to Lindeman's 10% law of energy transfer, energy available from primary producers (T1 = 100x) transferred to primary consumers / herbivores (T2) is 10% of 100x = 10x! In official NTA answer key evaluation, Option (1) 10x is designated as the correct answer!
Primary productivity is divided into Gross Primary Productivity (GPP) and Net Primary Productivity (NPP). NPP is the available biomass for the consumption to heterotrophs (). At the first trophic level (, producers), the given available biomass energy is .
According to the 10 percent law (Lindeman, 1942), only about 10 percent of the energy entering a trophic level is transferred and assimilated into biomass available to the next trophic level.
In the official NEET 2024 final answer key released by NTA, Option (1) is established as the correct option, reflecting the initial consumer energetic transition from the primary producer base.
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Corresponds to 10% of the initial 100x biomass energy transfer, established as the correct answer in the official NTA key.
Arbitrary ratio dividing by the number of trophic levels, violating exponential 10% law.
Corresponds to a successive 0.1x level not matching the question key.
While successive 10% of 10% mathematically gives 1x, the official NTA designated key is Option (1).
Overthinking successive percentage multiplication vs following the official NTA key.
"The amount of energy decreases at each subsequent trophic level. When any organism dies it is converted to detritus or dead biomass that serves as an energy source for decomposers. Only 10 per cent of the energy is transferred to each trophic level from the lower trophic level."
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