In an ecosystem, different species occupy different levels and vertical distribution of species is found. This is called _.
In an ecosystem, different species occupy different levels and vertical distribution of species is found. This is called _.
Options
Correct option: A — Stratification
The vertical distribution of different species occupying different levels in an ecosystem is called stratification.
- For example, in a forest, tall trees form the top layer, shrubs the middle, and herbs/grasses the ground layer.
Marking Scheme
- 11 mark: correct option A (Stratification).
- 2Full mark for the correct choice only.
Hint
It is the technical term for vertical layers of trees, shrubs and herbs in a forest.
Quick Oral Answer
The vertical distribution of species at different levels of an ecosystem is called stratification, as in a forest with trees, shrubs and herbs at different heights.
Analysis & Explanation
Concept
Stratification is a component of the species composition and structure of an ecosystem, describing the vertical arrangement of different species at different levels.
Why A is correct
- Stratification is the NCERT term for the vertical distribution of species. In a forest, trees occupy the upper stratum, shrubs the middle, and herbs and grasses the lowest — a clear example.
Why the distractors are wrong
- Layering — a loose, informal word; not the technical term used in NCERT for this phenomenon.
- Fragmentation — habitat fragmentation is a cause of biodiversity loss (habitat breaking into patches), not vertical distribution.
- Population — a group of individuals of the same species in an area; it does not describe vertical layering of different species.
Exam trap
"Layering" sounds plausible but is not the accepted term; the examiner expects the precise word stratification.
Common Mistakes
- 1Choosing 'Layering' as a synonym — NCERT specifically uses the term stratification.
- 2Confusing stratification with fragmentation, which refers to habitat breaking into patches.
- 3Selecting 'Population', which concerns individuals of a single species, not vertical species distribution.
Interesting Facts
Stratification and species composition are the two main structural features of an ecosystem described in NCERT.
A tropical rainforest can show four or more distinct vertical strata — emergent, canopy, understorey and forest floor — each with characteristic species.
Spotted a mistake or something unclear?
Tell us — we fix reported answers fast.
Frequently Asked Questions
What is stratification in an ecosystem?
Stratification is the vertical distribution of different species occupying different levels within an ecosystem. In a forest, for example, tall trees form the top stratum, shrubs the middle, and herbs and grasses the bottom, giving a layered structure.
How is stratification different from fragmentation?
Stratification refers to the natural vertical layering of species within a habitat. Fragmentation is the breaking up of a continuous habitat into smaller isolated patches and is a major cause of biodiversity loss, not a structural feature.