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

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

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

4. 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.

5. Plant respiration captures CO₂.

6. The rate of respiration decreases with temperature.

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

8. The annual cycle of photosynthesis mainly follows

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

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

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

12. High soil moisture leads to decreased photosynthesis.

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

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

15. Transpiration decreases as air becomes drier.