Which of the following groups of organisms help in keeping the environment clean?

Correct option is A

The correct answer is option (a) Bacteria and Fungi

Bacteria and fungi are essential decomposers in the ecosystem. They play a crucial role in keeping the environment clean by breaking down dead organic matter, recycling nutrients, and decomposing waste.

Information Booster :-

•  Algae are simple, plant-like organisms that belong to the Kingdom Protista. They are autotrophic, meaning they produce their own food through photosynthesis.
  
•  Protozoa are unicellular, eukaryotic organisms that belong to the Kingdom Protista. They are heterotrophic, meaning they depend on other organisms for food.
  
•  Lichens are a symbiotic association between a fungus (provides structure and water absorption) and a photosynthetic partner (algae or cyanobacteria).