Question 77

Photosynthesis contributes to the carbon cycle by converting atmospheric carbon dioxide into sugars.

Photosynthesis plays a crucial role in the carbon cycle by transforming carbon dioxide from the atmosphere into organic compounds, specifically sugars, which are essential for plant growth and energy.

A) By converting atmospheric carbon dioxide into sugars

This option is correct as photosynthesis directly involves the conversion of carbon dioxide and water into sugars and oxygen using sunlight. This process not only removes carbon dioxide from the atmosphere but also stores carbon in the form of sugars, which can be utilized by the plant and other organisms that consume the plant.

B) By increasing carbon dioxide absorption by animals

This option is incorrect because animals do not absorb carbon dioxide; they primarily exhale it as a byproduct of respiration. Animals rely on plants for oxygen and do not contribute to the absorption of atmospheric carbon dioxide.

C) By producing carbon monoxide

This option is incorrect as photosynthesis does not produce carbon monoxide. Instead, it produces oxygen as a byproduct. Carbon monoxide is a harmful gas and is not a product of the photosynthetic process.

D) By releasing carbon dioxide into the atmosphere

This option is incorrect because photosynthesis actually decreases atmospheric carbon dioxide levels by converting it into glucose and oxygen. While respiration by plants and animals does release carbon dioxide, photosynthesis itself does not contribute to this release.

Conclusion

Photosynthesis is vital to the carbon cycle as it effectively converts atmospheric carbon dioxide into sugars, thus reducing carbon dioxide levels and providing energy for various life forms. The other options misrepresent the roles of photosynthesis or are unrelated to its function, highlighting why Option A is the only correct choice in this context.