NEET · Biology —

Ecosystem appeared 3 times across 1 year — 3.3% of Biology. This question is from Ecological Pyramids - Inverted Pyramids.

Year 2024 Total
Questions 3 3
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Ecological pyramids represent the relationship between the organisms at different trophic levels and they are generally inverted for:

Solution & Explanation

Related Formula

Pyramid of Biomass in Sea: Biomass of Fishes (Consumers) > Biomass of Phytoplankton (Producers) arrow Inverted

Core Logic

The pyramid of biomass in a sea/aquatic ecosystem is generally inverted because the biomass of primary producers (phytoplankton) is small compared to that of consumers (zooplankton and fishes) due to the rapid turnover rate of phytoplankton.

Step 1: Checking Other Options
  • Pyramid of energy is ALWAYS upright in all ecosystems.
  • Pyramid of number in grassland is upright.
  • Pyramid of biomass in grassland is upright.
Pattern Recognition

Sees: "inverted ecological pyramid". Shortcut: Pyramid of biomass in sea/ocean is inverted; Pyramid of energy is ALWAYS upright.

Chapter Mix

Class 12 Biology: Ecosystem

Reference Study Guides

Ecosystem

More Ecosystem Previous-Year Questions

Q94 neet_2024_05_may_morning Ecosystem Productivity
Match List I with List II :
List IList II
A.ProductivityI.Gross primary productivity minus respiration losses
B.Net primary productivityII.Rate of formation of new organic matter by consumers
C.Gross primary productivityIII.Rate of biomass production
D.Secondary productivityIV.Rate of production of organic matter during photosynthesis
Choose the correct answer from the options given below:
  • A. A-I, B-II, C-III, D-IV
  • B. A-III, B-I, C-IV, D-II
  • C. A-III, B-I, C-II, D-IV
  • D. A-I, B-III, C-IV, D-II

Solution

Related Formula

NPP = GPP - R

Core Logic
  • Productivity: Rate of biomass production arrow III
  • Net primary productivity: GPP - R arrow I
  • Gross primary productivity: Rate of organic matter production during photosynthesis arrow IV
  • Secondary productivity: Rate of formation of new organic matter by consumers arrow II
Step 1: Match Verification

Matches: A-III, B-I, C-IV, D-II. Correct option is (2).

Pattern Recognition

NPP is always GPP minus respiration losses (NPP = GPP - R). B-I immediately singles out option (2) or (3). Secondary productivity is by consumers (D-II), confirming option (2).

Chapter Mix

Class 12 Biology: Ecosystem

Q99 neet_2024_05_may_morning Decomposition Steps
Match List I with List II:
List-IList-II
A.DecompositionI.Accumulation of dark coloured amorphous colloidal substance
B.DetritusII.Release of inorganic nutrients by the activity of microbes in soil
C.MineralisationIII.Breaking down of complex organic matter into inorganic substances.
D.HumificationIV.Dead remains of plants and animals including fecal matter
Choose the correct answer from the options given below:
  • A. A-I, B-II, C-III, D-IV
  • B. A-IV, B-III, C-I, D-II
  • C. A-III, B-IV, C-II, D-I
  • D. A-III, B-II, C-I, D-IV

Solution

Related Formula

Decomposition processes: Fragmentation, Leaching, Catabolism, Humification, Mineralisation.

Core Logic
  • Decomposition: Breaking down complex organic matter into inorganic substances arrow III
  • Detritus: Dead remains of plants/animals including fecal matter arrow IV
  • Mineralisation: Release of inorganic nutrients by microbial activity arrow II
  • Humification: Accumulation of dark coloured amorphous substance (humus) arrow I
Step 1: Match Verification

Correct match sequence: A-III, B-IV, C-II, D-I. Correct option is (3).

Pattern Recognition

Humification = Humus accumulation (D-I). Detritus = Dead remains (B-IV). Instantly isolates option (3).

Chapter Mix

Class 12 Biology: Ecosystem

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JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%) | JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%)