Following are the two statements regarding the origin of life :(a) The earliest organisms that appeared on the earth were non-green and presumably anaerobes.(b) The first autotrophic organisms were the chemoautotrophs that never released oxygen.Of th…

Following are the two statements regarding the origin of life :

(a) The earliest organisms that appeared on the earth were non-green and presumably anaerobes.

(b) The first autotrophic organisms were the chemoautotrophs that never released oxygen.

Of the above statements which one of the following options is correct ?

1. (a) is correct but (b) is false.

2. (b) is correct but (a) is false.

3. Both (a) and (b) are correct.

4. Both (a) and (b) are false.

Doubtly Asked 30 Oct 2026 NEET UG 2016 Phase 1 Practice test neet Save WhatsApp Report

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Answer: 3. Both (a) and (b) are correct.

Both statements are correct.

Life began in an oxygen-free atmosphere, so the first cells were non-green, heterotrophic anaerobes.
The first autotrophs were chemoautotrophs, which made food using chemical energy and did not release oxygen. Oxygen came later with photosynthetic cyanobacteria.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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