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Photosynthesis increased the amount of which gas in Earth's atmosphere?

Answer and explanation

Correct answer: Oxygen

Photosynthesis increased atmospheric oxygen. Green plants, algae and cyanobacteria use light energy to convert carbon dioxide and water into food, and oxygen is released as a by-product. Over very long periods, this release gradually changed the atmosphere and made aerobic respiration possible for many organisms. Option D is therefore correct. Helium is a very light noble gas and is not produced by photosynthesis; methane and ammonia may occur through geological or biological processes, but they are not the gas released by this reaction. The question asks about the broad atmospheric effect, not every later change in gas composition.

Related tags

PhotosynthesisOxygenAtmospheric EvolutionEvolution Of The EarthThe Origin And Evolution Of The EarthGeographyClass 11 Mcq

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