Q. 50 Which of the following statements is TRUE for an ecotone?
(A) An ecotone is the synonym of an ecosystem
(B) An ecotone is an interface zone of two or more ecosystems
(C) An ecotone is a special feature of land biomes
(D) An ecotone is exclusively characterized by decreased biodiversity

An ecotone represents a critical ecological concept often tested in biology exams. The correct answer to this multiple-choice question is option (B), as it accurately defines the term.

Correct Answer

Option (B) states: “An ecotone is an interface zone of two or more ecosystems.” This holds true because ecotones serve as transitional boundaries where adjacent ecosystems meet and blend, such as forest-grassland edges or estuary-freshwater interfaces.​

Option Analysis

Each option undergoes scrutiny to clarify misconceptions common in academic settings.

• (A) An ecotone is the synonym of an ecosystem: False. Ecosystems encompass entire communities and environments, while ecotones specifically denote transition zones between them, not equivalents.​

• (B) An ecotone is an interface zone of two or more ecosystems: True. This captures the core definition as a junction or integration area between biomes, exhibiting traits of both.​

• (C) An ecotone is a special feature of land biomes: False. Ecotones occur across aquatic, terrestrial, and mixed environments, like mangroves between marine and land systems.​

• (D) An ecotone is exclusively characterized by decreased biodiversity: False. Ecotones typically show increased species richness and density due to the edge effect, hosting species from adjacent areas plus unique ones.​

Key Characteristics

Ecotones feature distinct properties that enhance their ecological role.

• Transitional nature with sharp or gradual boundaries based on environmental shifts.​

• Zone of tension with intermediate conditions, supporting higher biodiversity.​

• Examples include grassland-forest edges and riverbanks, both natural and human-induced.​