Question

Which of the following is/are trend (s) in ecological succession?

(i) An increase in the complexity of species.

(ii) An increase in productivity.

(iii) An increase in community stability and species diversity.

(iv) A decrease in non-living organic materials.

A. (i) and (iii)
B. (i) and (iv)
C. (i), (ii) and (iii)
D. (i), (ii), (iii) and (iv)

Answer 1

Hint: Ecological succession is the gradual method by which ecosystems modify and develop over time. Nothing remains an equivalent and habitat square measure perpetually dynamical. In action the biomass overall decreases. Their square measures 2 main kinds of succession, primary and secondary. that the correct choice is 'Species diversity, biomass increases'.

Complete step by step answer: Ecological succession is the process by which an ecosystem changes over time as different species replace each other. The trend of increased complexity of species and increased community stability has been noted in a number of studies, and it is believed that this trend is due to increasing productivity. Productivity refers to both natural (e.g., agricultural) and technological (e.g., industrial) improvements in human societies. These improvements allow for a greater variety and abundance of resources, which in turn allows for more complex ecosystems.
As communities become more stable, they are better able to withstand environmental challenges such as climate change or shortages of specific nutrients or minerals. In fact, some studies have found that increases in community stability may actually lead to reductions in stress levels among populations due to reduced competition for resources. This increase in biodiversity also leads to improved ecological function overall: higher rates of decomposition, nutrient turnover, etc.
Hence, option C is correct.

Note:: The ultimate aim of this method is to achieve equilibrium within the scheme. The community that achieves this aim is termed a climax community. In a trial to achieve this equilibrium, some species increase in variety whereas some others decrease.It is a method by which Associate in Nursing ecological community undergoes a lot of or less orderly and certain changes following a disturbance or the initial settlement of a replacement environment.