Question 77

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

Through the process of photosynthesis, plants convert carbon dioxide from the atmosphere into organic compounds, specifically sugars, which are essential for their growth and energy needs.

A) By converting atmospheric carbon dioxide into sugars

This option is correct as it directly describes the primary role of photosynthesis in the carbon cycle. During photosynthesis, plants utilize carbon dioxide, along with water and sunlight, to produce sugars, which serve as energy sources for the plant and contribute to the carbon cycle by removing carbon dioxide from the atmosphere.

B) By increasing carbon dioxide absorption by animals

This option is incorrect because photosynthesis does not increase carbon dioxide absorption by animals. Instead, animals rely on the oxygen produced during photosynthesis and exhale carbon dioxide, which is then used by plants in the photosynthetic process.

C) By producing carbon monoxide

This option is incorrect as photosynthesis does not produce carbon monoxide. The process primarily involves the conversion of carbon dioxide into sugars and the release of oxygen, making carbon monoxide irrelevant in the context of photosynthesis.

D) By releasing carbon dioxide into the atmosphere

This option is incorrect because photosynthesis actually removes carbon dioxide from the atmosphere rather than releasing it. While respiration by organisms does release carbon dioxide, photosynthesis plays a critical role in sequestering it from the air.

Conclusion

Photosynthesis is essential to the carbon cycle as it converts atmospheric carbon dioxide into sugars, thereby reducing greenhouse gas levels and providing energy for plant growth. All other options either misrepresent the process or describe unrelated phenomena, emphasizing the significance of photosynthesis in maintaining ecological balance and supporting life on Earth.