photosynthesis

• is the process by which green plants make their own food
• water + co2 - light and chlorophyll -> oxygen + glucose
• the light reaction - light energy trapped in chlorophyll

  - light energy -> chlorophyll

  - energy splits water into oxygen + hydrogen

  - oxygen s a bi-product so diffuses out

  - hydrogen + ATP stay in chlorophyll
• carbon fixation - a series of enzyme controlled reactions

  - hydrogen from light reaction + co2 from air use

  ATP to form glucose
• glucose used for - respiration , stored starch , cellulose for structure
• limiting factors are temperature , co2 concentration , light intensity