Q27.5-1CC - Campbell Biology

Question

Explain how prokaryotes, though small, can be considered giants in their collective impact on Earth and its life.

Step-by-Step Solution

Answer

Prokaryotes are the microscopic organisms present in the ecosystem. They play an important role in the effective functioning of the Earth and all its life forms. 

 

Prokaryotes’effective roles include decomposition of wastes and chemicals, performing several metabolic activities. They also help different organisms’ in interactions like parasitism and mutualism.

Step 1: Prokaryotes

The prokaryotes are small unicellular creatures found on Earth. Bacteria and Archaea are two different forms of prokaryotes. Prokaryotes specifically do not possess a nucleus or any other organelles in their structure.

 

Step 2: Life or prokaryotes on Earth

Prokaryotes existed on the Earth about 4.2 billion years ago. They were the first living organisms to be found on the Earth. Since then, they have played an important role in balancing the ecology of the organisms on Earth.

 

Initially, they survived on the carbon compounds found in the ocean beds of the Earth. Further, they started using the energy obtained from the Sun and other elements like sulfide to produce their energy for survival.Until 3.7 billion years ago, prokaryotes were the only living organisms present on the planet.

Step 3: Importance of prokaryotes on the planet

Prokaryotes are of much importance on the planet, as they play a key role in many metabolic processes occurring in the environment. They recycle the nutrients from the dead and decomposed organisms.

 

Due to all these reasons, microscopic organisms are of great importance to all the life forms on the planet. Biogeochemical cycles are regulated by the prokaryotes, such as the carbon and nitrogen cycle.