Question 30

Oxygen is crucial for the survival of most life forms and is released during photosynthesis.

During photosynthesis, oxygen is produced as a byproduct when plants convert carbon dioxide and water into sugars using sunlight. This oxygen is essential for the survival of nearly all organisms, as it is required for cellular respiration.

A) Nitrogen

Nitrogen is an important element for life, primarily as a component of amino acids and nucleic acids, but it is not produced during photosynthesis. Therefore, it does not play a role in the process of photosynthesis nor is it released during this process.

B) Carbon dioxide

Carbon dioxide is a vital reactant in photosynthesis, as it is one of the substances that plants use to produce sugars. However, it is consumed during the process rather than released, making it unsuitable as the answer to the question regarding gases released during photosynthesis.

C) Oxygen

Oxygen is the correct answer as it is released into the atmosphere during photosynthesis. It is generated as a byproduct when chlorophyll absorbs sunlight and facilitates the conversion of carbon dioxide and water into glucose. This oxygen supports the respiration of most life forms on Earth.

D) Hydrogen

Hydrogen is not a gas that is released during photosynthesis. While hydrogen is involved in the chemical reactions of photosynthesis, it is not released as a gas; instead, it combines with carbon dioxide to form glucose.

Conclusion

Oxygen is definitively the correct answer as it is the gas released during photosynthesis that is crucial for the survival of most life forms. In contrast, nitrogen, carbon dioxide, and hydrogen either play different roles in the process or are not released as gases, which confirms that they do not meet the criteria set by the question.