The entire sequence of communities that successively change in a particular area are called

The answer is B) Sere. A sere is the complete series of communities that replace one another in a given area over time, starting from a bare or disturbed site and moving towards a relatively stable climax community. Each intermediate stage is called a seral stage or seral community.

• A) Ecological succession is the process itself, the directional change in species composition and structure over time. The question asks for the sequence of communities, which is the sere, not the process that produces it.
• C) Community dynamics is a broad term covering all changes in community structure, including fluctuations that have nothing to do with directional succession. It is not the standard term for this sequence.
• D) Pyramid of biomass is a graphical representation of standing crop biomass at each trophic level. It has no connection with successive community change.

Core concept: primary succession begins on bare rock or newly exposed land, while secondary succession begins on disturbed soil where the seed bank and soil survive. This links to Mains questions on land degradation, restoration of ecosystems and afforestation.

Trap: candidates pick "Ecological succession" because it sounds like the answer. Remember the rule: the process is succession, and the sequence of communities it produces is the sere.