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Ecosystem — NEET Biology MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

30questions
10/14/6easy / medium / hard
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Sample questions from this chapter

Vertical distribution of species into forest layers is called
  1. stratification ✓
  2. mineralisation
  3. productivity
  4. fragmentation
Answer: A. Trees, shrubs and herbs occupy different vertical strata, creating a characteristic physical structure in a forest ecosystem.
Why not B: Mineralisation releases inorganic nutrients from organic matter.
Why not C: Productivity is the rate of biomass production.
Why not D: Fragmentation breaks detritus into smaller particles.
Why is productivity expressed per unit area per unit time, unlike production alone?
  1. Productivity measures the rate of biomass formation and permits ecosystem comparisons ✓
  2. Productivity excludes every producer
  3. Production always measures consumer number
  4. Time units convert biomass into heat
Answer: A. An amount of organic matter becomes a productivity value when normalised to both space and time, such as g m^-2 yr^-1.
Why not B: Primary productivity specifically measures producer output.
Why not C: Consumer organic-matter formation is secondary productivity, not the definition of production.
Why not D: Adding a time dimension describes rate; it does not convert matter into heat.
Two ecosystems have equal GPP, but forest X has higher plant respiration than forest Y. Which prediction follows?
  1. X has lower NPP and therefore less newly produced biomass available to heterotrophs ✓
  2. X has higher NPP because respiration creates biomass
  3. Both have equal NPP because GPP alone determines it
  4. Y has no decomposition
Answer: A. With the same gross fixation, a larger respiratory cost leaves a smaller net balance for plant growth and transfer through grazing or detrital routes.
Why not B: Respiration consumes part of gross production.
Why not C: NPP depends on the difference between GPP and plant respiration.
Why not D: Relative NPP does not establish absence of decomposers.

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Other NEET Biology chapters

The Living WorldBiological ClassificationPlant KingdomAnimal KingdomMorphology of Flowering PlantsAnatomy of Flowering Plants

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Questions

How many NEET questions are there on Ecosystem?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 12 chapter.

Is this NEET Biology chapter test free?

Yes. Every chapter test is free with no login. The only paid thing on the site is the full-length 90-question Biology mock and its all-India rank.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.