UGC NET Questions (Paper – 1)

Ecological succession describes the orderly process of community change in which different species colonise,establish and are replaced over time. This process often leads to a more complex and stable climax community suited to local conditions. The stem outlines exactly this gradual and sequential change,so succession is the correct term.

Option A:
Succession may begin with pioneer species on bare substrate and progress through several seral stages. It reflects both biotic interactions and environmental modifications. Because the question refers to these temporal changes towards a climax, this option fits perfectly.

Option B:
Inversion is a meteorological term related to temperature profiles in the atmosphere and has little to do with community species composition. Therefore it does not match the ecological process described.

Option C:
Competition is an interaction between species or individuals for limited resources. While it influences succession, it is only one mechanism and not the overall process itself. Hence it cannot fill the blank accurately.

Option D:
Eutrophication involves nutrient enrichment of water bodies leading to excessive plant growth and oxygen depletion. It is a specific form of ecosystem change,not the general sequence of community development referred to in the stem.