Summary

- Photosynthesis: carbon dioxide + water > glucose + oxygen

- Limiting factors: temperature, CO2, light intensity

- Daytime: respiration & photosynthesis; night-time: respiration

- Plant hormone, auxin, responds to light, gravity and moisture

- Light destroys auxin

- Auxin speeds up plant growth

- Water travels around the plant via the transpiration system

- Xylem and phloem vessels transport water, minerals and food

- Water is needed in green plants for structure and support