Question

The first organisms on primitive earth were
a. autotrophic
b. heterotrophic and anaerobic
c. parasitic
d. prokaryotic and autotrophic

Answer 1

Dear Student,

◆ Answer -

The first organisms on primitive earth were heterotrophic and anaerobic.

● Explanation -

• In primitive earth the atmosphere was anaerobic. i.e. had limited oxygen.
• Hence, first organisms were also anaerobic.
• As they were primitive organisms, they were prokaryotic unicellular organisms with heterotrophic nutrition.

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Answer 2

Answer:

The first organisms on primitive earth were b. heterotrophic and anaerobic

Explanation:

The first organisms on primitive earth were anaerobic and hetero-trophic bacteria. The modern cyno-bacteria had almost the similar structure as that of to the ancient anaerobic bacteria. Photosynthesis firstly occurred in these bacteria's which used to maintain the enriched oxygen levels in the atmosphere. Cyno bacteria was the main organism responsible for life above sea level. The cyno bacteria is also called as the “Blue Algae”.