Light intensity

• light provides the energy to power the first stage of photosynthesis and produce ATP and reduced NADP needed for the next stage.
• Light also causes stomata to open so that gaseous exchange can occur. When stomata are open, transportation can occur which will lead to the uptake of water and the delivery of water to the leaves.
• At a constant favourable temperature and constant suitable carbon dioxide concentration, light intensity ix a limiting factor. when the light intensity is low, then the rate of photosynthesis is low- as it increases, so does the rate of photosynthesis.~
• At a certain point, even when light intensity increases the rate of photosynthesis will not increase as another factor is limiting the rate of photosynthesis.
• If there is little or no light, then:

  1. GP cannot be reduced into TP
  2. TP levels fall and GP will begin to accumulate
  3. Due to the falling levels of TP, RuBP cannot be regenerated.