1. A complex microbiota lives belowground, releasing carbon dioxide to the soil.

2. To transform atmospheric CO₂ into organic molecules, plants can use the energy from

3. Carbon becomes locked as part of the accumulating plant biomass as plants grow.

4. At low air humidity, a plant closes its stomata to prevent transpiration. The action also decreases photosynthesis

5. De-hardening in spring involves gradual re-hydration of the cells, recovery of photosynthetic capacity and a tight control of water loss.

6. Transpiration decreases as air becomes drier.

7. High soil moisture leads to decreased photosynthesis.

8. The rate of respiration decreases with temperature.

9. Leaf area increases with stand age, resulting in a decreasing rate of photosynthesis in the stand.

10. In general, the more carbon dioxide that is available to the plant, the faster the rate of photosynthesis – if other factors are favourable.

11. Photosynthesis of a tree canopy is driven or influenced by

12. The effect of light on photosynthesis has a clear saturating pattern: more light results in more photosynthesis but eventually leaves cannot take full advantage of all the extra light.

13. The annual cycle of photosynthesis mainly follows

14. Plant respiration captures CO₂.

15. Carbon capture is performed by the green parts of plants via photosynthesis.