In the absence of decomposers, ecosystem functioning is adversely affected due to
(a) Blocking of energy flow
(b) Blocking of mineral cycling
(c) Blocking of solar energy to herbivores
(d) Rate of decomposition of other components will increase

Hint: An ecosystem is characterized as a community of lifeforms that compete with non- living components and interact with each other. Decomposers include saprophytes like fungi and bacteria. They directly flourish on the dead and decaying organic matter. Decomposers are essential for the ecosystem as they assist in recycling nutrients to be reused by plants.

Complete answer:
A food chain is a series of plants/animals which are interconnected within the sort of organism being eaten as food by the other organism. Trophic levels during a food chain are formed by producers, consumers, and decomposers. Within the given food chain, plants are producers. The animals eating plants are known as primary consumers and animals eating primary consumers are known as secondary consumers. Decomposers are those which decompose the waster organic matter and release energy back within the environment. They cycle the varied minerals between the environment and living organisms. Hence, within the absence of decomposers, ecosystem functioning is adversely affected due to the blocking of mineral cycling. The role of a decomposer within the ecosystem: - They act as a cleanser of the environment by decomposing the dead plants and animals. - They help in recycling the nutrients. - They provide space for new beings within the biosphere by decomposing the dead. - They help in putting back the varied elements into the water, soil, and air for the reuse of producers like crop plants.
The correct answer is '(b) Blocking of mineral cycling.'

Note: Death and decomposition are an important part of all life cycles on earth. So to allow a successful continuation of life and growth of the latest plants and animals, older specimens must die and decompose. This process provides essential nutrients for plants and also for the expansion and development of the latest organisms.