BIO NMDCAT Concept of Evolution

nmdcat.online July 14, 2026

19. The absence of ozone in Earth’s early atmosphere most likely increased the availability of:

A. Ultraviolet radiation capable of driving chemical reactions

✓

B. Oxygen required for respiration

C. Nitrogen fixation by plants

D. Photosynthesis in algae

📝 Explanation

Correct: Without an ozone layer, intense UV radiation reached Earth's surface and acted as an energy source. B, C, D: These are unrelated to the absence of ozone at that stage. Concept: Energy sources for chemical evolution.

📖 Additional Information

Ultraviolet radiation capable of driving chemical reactions
Oxygen required for respiration
Nitrogen fixation by plants
Photosynthesis in algae

Correct: Without an ozone layer, intense UV radiation reached Earth's surface and acted as an energy source. B, C, D: These are unrelated to the absence of ozone at that stage. Concept: Energy sources for chemical evolution.

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