Ecological pyramids — NEET Biology Questions

Practice 30 questions on Ecological pyramids from Ecosystem (NCERT Class 12, Chapter 12). Free samples below — get all 30 in the app.

30 Questions Ecosystem Class 12

Sample Questions — Ecological pyramids

Try 5 questions below from Ecological pyramids. Get all 30 in the MedicNEET app.

MCQ
Match the Column: Column I A. Pyramid of number B. Pyramid of biomass C. Pyramid of energy D. Tree ecosystem Column II I. Can be inverted II. Always upright III. Based on weight IV. Inverted number pyramid
  • A. A–I, B–III, C–II, D–IV
  • B. A–IV, B–II, C–III, D–I
  • C. A–II, B–IV, C–I, D–III
  • D. A–III, B–I, C–II, D–IV
✅ Correct Answer: A
Pyramid of number → Can be inverted; Biomass pyramid → Based on mass (can be inverted or upright); Pyramid of energy → Always upright; Tree ecosystem → Inverted number pyramid.
MCQ
Assertion (A): Ecological pyramids always depict accurate flow of matter and energy. Reason (R): Organisms operating at multiple trophic levels can be shown clearly in pyramids.
  • A. Both A and R are true, and R is the correct explanation of A
  • B. Both A and R are true, but R is not the correct explanation of A
  • C. A is false, but R is true
  • D. Both A and R are false
✅ Correct Answer: D
Ecological pyramids have limitations — they do not show omnivory, decomposers, or food web complexities accurately.
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MCQ
Why is it incorrect to assume all pyramids are upright in structure?
  • A. Producers always dominate biomass
  • B. Decomposers alter pyramid shapes
  • C. Consumers are absent in aquatic ecosystems
  • D. Some ecosystems have inverted biomass or numbers
✅ Correct Answer: D
In forests or aquatic systems, pyramids of number or biomass may be inverted, while energy pyramid remains upright.
MCQ
Assertion (A): Ecological pyramids are accurate representations of ecosystem structure. Reason (R): Food webs are effectively illustrated using pyramid models.
  • A. Both A and R are true, and R is the correct explanation
  • B. A is true, R is false
  • C. A is false, R is true
  • D. Both A and R are false
✅ Correct Answer: D
Pyramids oversimplify complex food webs and fail to depict decomposers and omnivory.
MCQ
Which organisms are not depicted in ecological pyramids despite their critical role?
  • A. Decomposers
  • B. Primary consumers
  • C. Herbivores
  • D. Tertiary carnivores
✅ Correct Answer: A
Decomposers are crucial in nutrient cycling but are not typically represented in ecological pyramids.

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