Anaerobic fermentation & Photosynthesis

missed stuff

Anaerobic vs Aerobic

Photosynthesis

effect of light intensity

CO2 concentration

temperature

effect of water availability

• source of water is the soil in which the plants are growing

• uptake of water depends on an efficient root system

  • live cell that are respiring

  • branching roots/root hairs to max surface area

• water is lost from the leaves through the stomata, when the stomata are open

water deficit

• when water lost from leaves is greater than the uptake of water

  • plants closes stomata

  • reduces uptake of CO2 into the leaves

  • CO2 levels within the mesophyll cells falls

  • calvin cycle reduced/stopped

water logging

• when more rain falls that the plant can absorb

  • air spaces surrounding the roots gets filled with water

  • oxygen availability to the roots is limited

  • root cells are not able to respire

  • root cells can become permanently damaged

  • water uptake fro the leaves reduced

  • photolysis reduced/stopped

do plants intake oxygen?

However, plants also require oxygen for their respiration process. They take in oxygen through small openings in their leaves called stomata, especially at night when photosynthesis does not occur.

limiting factors

why is water not a limiting factor?

• Cus they have a lot of water in the plant already 

• But lack of water → stomata close (to reduce the loss of water) → not getting CO₂ → rate of photosynthesis 

• Too much water → roots can’t respire anymore 

Compensation point

• When PHS = RESP 

• Below - using more O₂ than produced - decrease in O₂ levels 

• Above - O₂ level increasing (more PHS than RESP) - CO₂ levels decrease

• Below = decrease mass change

• Compensation point = no mass change

• Above = increase in mass (photosynthesis)