In plants, which one of the following gases is released during Photosynthesis ?

Photosynthesis is the biological process by which green plants, algae, and certain bacteria convert light energy into chemical energy. During this process, plants use carbon dioxide and water as raw materials in the presence of sunlight and chlorophyll to produce glucose (energy-rich organic material) and oxygen [3]. While carbon dioxide is absorbed from the atmosphere through tiny pores called stomata, oxygen is released as a major byproduct or 'waste' product into the air [4]. This exchange is critical for aerobic life on Earth, as animals and other organisms rely on the oxygen released by plants for cellular respiration [1]. Experimental evidence, such as the relighting of a matchstick in the presence of gas collected from aquatic plants, confirms that the gas evolved during photosynthesis is indeed oxygen [5].

Sources

1. [2] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 1: BASIC CONCEPTS OF ENVIRONMENT AND ECOLOGY > photosynthEsis. > p. 14
2. [3] Science-Class VII . NCERT(Revised ed 2025) > Chapter 10: Life Processes in Plants > In a Nutshell > p. 150
3. [4] Science , class X (NCERT 2025 ed.) > Chapter 5: Life Processes > ATP > p. 89
4. [1] Science-Class VII . NCERT(Revised ed 2025) > Chapter 10: Life Processes in Plants > 10.2.4 How do leaves exchange gases during photosynthesis? > p. 146
5. [5] Science-Class VII . NCERT(Revised ed 2025) > Chapter 10: Life Processes in Plants > Activity 10.5: Let us explore > p. 145