The area that acts as a boundary or a transition zone between two ecosystems is known as
- (a)Ecosphere
- (b)Ecoboundary
- (c)Ecotwin
- (d)Ecotone
Correct — D, Ecotone. An ecotone is a transitional zone between two distinct ecosystems or biological communities (e.g. where a forest meets a grassland, or land meets water). It often has features of both bordering ecosystems and, due to the 'edge effect,' can support greater species diversity than either community alone.
- (a)Ecosphere — The ecosphere (biosphere) refers to the entire global zone of life on Earth — a totally different scale from a local transition zone between two ecosystems.
- (b)Ecoboundary — Not a standard ecological term used for this concept — the established term is 'ecotone.'
- (c)Ecotwin — Not a recognised ecological term at all — a distractor with no scientific meaning.
An ecotone is the transition zone where two ecosystems or biological communities meet and overlap (e.g. forest-grassland, land-water). Because it shares species and conditions from both adjoining zones, an ecotone often shows the 'edge effect' — higher species density and diversity than the interior of either neighbouring community.
The exam trap is confusing scale-based ecological terms: 'ecotone' is a local transition zone, while 'ecosphere/biosphere' is the planet-wide zone of life. The other two options (Ecoboundary, Ecotwin) are invented terms meant to test whether the student actually knows the correct vocabulary rather than just recognising the 'eco-' prefix.
- Ecotone: transition zone between two ecosystems/biological communities
- Shows the 'edge effect' — often higher species diversity than either bordering community
- Examples: forest-grassland boundary, mangrove (land-sea transition), riverbank
- Ecosphere/biosphere is a different, planet-scale term — not to be confused with ecotone
An ecotone is the boundary zone where two ecosystems meet, often richer in species than either side (edge effect).
- Confusing 'ecotone' (local transition zone) with 'ecosphere/biosphere' (global scale)
- Picking a plausible-sounding but invented term (e.g. 'Ecoboundary') over the correct technical term
MPPSC and other state PCS exams frequently ask for the direct definition of 'ecotone,' sometimes paired with distractors like 'ecological niche' or 'habitat' to test precise vocabulary.
No directly related past PYQ was found.
- practice — not a real PYQ
The phenomenon of increased species diversity and density often observed at an ecotone is known as:
- (a)Edge effect
- (b)Ecological succession
- (c)Biomagnification
- (d)Trophic cascade
Answer(a) Edge effect — the higher species richness typically found in a transition zone (ecotone) between two ecosystems.
- practice — not a real PYQ
Which of the following is the best example of a natural ecotone?
- (a)The centre of a dense tropical forest
- (b)A mangrove forest at the land-sea margin
- (c)The middle of a large lake
- (d)A high-altitude glacier
Answer(b) A mangrove forest at the land-sea margin — a classic transition zone between terrestrial and marine ecosystems.