OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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Which process in the carbon cycle involves plants?

  1. Respiration relates the matter

  2. Photosynthesis takes in carbon dioxide

  3. Decomposition releases gases

  4. Fermentation of organic matter

The correct answer is: Photosynthesis takes in carbon dioxide

The process in the carbon cycle that involves plants is photosynthesis, which takes in carbon dioxide. During photosynthesis, plants absorb carbon dioxide from the atmosphere through small openings in their leaves called stomata. They utilize this carbon dioxide, along with sunlight and water, to produce glucose—a type of sugar that serves as food for the plant. This process also releases oxygen as a byproduct, which is essential for the survival of most living organisms. Photosynthesis is crucial in the carbon cycle because it serves as the primary mechanism by which carbon, a fundamental element for life, is captured from the atmosphere and converted into organic matter. This conversion forms the foundation of the food web, as many organisms depend on plants for energy and nutrients.

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