Question

For a clean environment, which one is not essential?
a. Producer
b. Polluter
c. Consumer
d. Decomposer

Answer 1

Hint: Ecology deals and described with the study of interactions and interrelationships between organisms and their environment. It is a branch of science which weaves the different areas of biological information into a unifying principle thus, it gives the holistic perspective to biology. Environment includes biotic and abiotic components on earth.

Complete answer:
The various levels that come under ecological organisations includes organism, population, community, ecosystem, landscape, biome and biosphere. These all interact with each other and make life possible and sustainable on earth.

For the clean environment, everything present on the earth should be maintained is a desired amount and should be sequential. Each and every organism is necessary for a cleaner and safer environment.

Now let us gather some information about given options:
> Producer: it constitutes the first trophic level of the food chain. They are autotrophic organisms that prepare their food by using sunlight and water. If these are not present in the environment the organisms that feed on them will die due to starvation.

> Polluter: undesirable substances that damage and contaminate the environment are termed as polluter. These cause the deterioration of the environment and pollute air, water and soil. So if these get eliminated there will be a good effect of environment.

> Consumer: these constitute the second trophic level in a food chain. They depend on producers to obtain their food and many other organisms depend on them to obtain food such as carnivores depend on herbivores for their food. So they are important constituents of the environment.

> Decomposer: these are the organisms that feed on dead decaying organisms and decompose them. These convert dead decaying organisms into fertilisers and manures. These are necessary to replenish the earth environment.

Hence, the correct answer is option (B).

Note: Insecticides are biologically active chemicals that act as polluters and are used for pest control. These include D.D.T., B.H.C., copper sulphate and aldrin etc. Aquatic microorganisms absorb them in fats and oils. Fish feeding on these zooplanktons and phytoplanktons further concentrate these pesticides in their tissues. Birds feeding on these fish concentrate these pesticides still more. The increased accumulation of these toxic substances in the food chain at higher trophic level is called biological magnification.