How do plants recycle carbon during photosynthesis?

The carbon in glucose is recycled during photosynthesis.
The carbon in oxygen molecules is recycled during photosynthesis
The carbon in carbon dioxide is recycled during the photosynthesis
The carbon in water is recycled during photosynthesis

1 answer

During photosynthesis, plants use energy from sunlight to convert carbon dioxide (CO2) into glucose. This process occurs in the chloroplasts of plant cells and involves several steps:

1. Carbon dioxide is taken in from the atmosphere through tiny openings called stomata on the leaves.

2. Inside the chloroplasts, the carbon atoms from CO2 are combined with hydrogen atoms from water (H2O) to form glucose (C6H12O6). This process is known as the Calvin cycle or carbon fixation.

3. The glucose can then be used by the plant for energy, stored as starch for future use, or used to build other organic molecules such as cellulose for cell walls.

4. As plants carry out cellular respiration, they break down glucose and release carbon dioxide back into the atmosphere. This occurs at all times, even during photosynthesis.

5. The released carbon dioxide can be taken up again by other plants, creating a cycle of carbon recycling.

In summary, plants recycle carbon during photosynthesis by converting carbon dioxide into glucose, which can then be used for energy or stored. This glucose is eventually broken down during respiration, releasing carbon dioxide back into the atmosphere.