Question

First organism which was evolved on the earth is

• A. Saprotrophs
• B. Chemoheterotrophs
• C. Photoautotrophs
• D. Chemoautotrophs

Answer 1

The correct option is B Chemoheterotrophs

When the first life form evolved, there were no atmospheric gases available for photosynthesis. The organism which evolved was a chemoheterotroph. The chemoheterotrophs are capable of using the chemical compounds as the source of energy. The chemoheterotrophs can use the energy and carbon from the organic compounds. The first evolved organism was the archaea which can use the organic and inorganic compounds.

So, the correct answer is 'Chemoheterotrophs'