1. Nitrogen
  2. Carbon dioxide
  3. Oxygen
  4. Hydrogen
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1 Answers

Option 3 : Oxygen

Oxygen is released during the process of photosynthesis. Photosynthesis is the process by which green plants produce glucose. 

  • It involves the conversion of carbon dioxide gas, water, and minerals the plants take in from their surroundings into sugar and gaseous oxygen.

Oxygen is the chemical element with the symbol O and atomic number 8.

  • It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds.

Nitrogen is the chemical element with the symbol N and atomic number 7.

  • It is a common element in the universe, estimated at seventh in total abundance in the Milky Way and the Solar System.

Carbon dioxide (CO2) is an important heat-trapping (greenhouse) gas, which is released through human activities such as deforestation and burning fossil fuels, as well as natural processes such as respiration and volcanic eruptions.

Hydrogen is a colorless, odorless, tasteless, flammable gaseous substance that is the simplest member of the family of chemical elements.

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