Correct option is D
Explanation-
Ecotones are the transitional zones between two different ecosystems or communities (e.g., forest and grassland). They are rich in biodiversity, often showing characteristics of both bordering ecosystems.
Correct Statements:
Option A - "Intertidal zones and estuaries are two examples of ecotones"
These are classic examples of ecotones where land and water ecosystems meet.
Option B - "They are transitional areas of vegetation between two different plant communities."
Ecotones connect different ecosystems and show mixed species.
Option C - "Populations in ecotones are potentially pre-adapted to changing environment."
Due to environmental variability, species in ecotones are often more adaptable.
Incorrect Statement:
Option D - "They harbour only K-selected species that can survive in changing habitats."
Ecotones contain a mix of r-selected (fast-reproducing, opportunistic) and K-selected (slow-reproducing, stable) species.
Claiming only K-selected species is wrong, as r-selected species also thrive due to variability and edge effects.
So, the correct answer is option D
